Identification Information
Citation
Originator:
College, Geology Department;
Stephen G. Weaver,
and
of Earth and Environment; Lindley
Hall, formerly at
at
formerly at
Publication Date: 2007
Title: Open-File Report O-07-13: Preliminary
Geologic Map of the
Woods South 7.5’
Quadrangle,
Publication Information:
Publication
Place:
Publisher: Oregon Department of Geology and Mineral Industries
Description:
Abstract: This data set contains the information used
to create the Preliminary Geologic Map of the
for Open-File
Report O-07-13. This map is one of a series of geologic maps created for
quadrangles in south-central
of the Cascade
Mountains just to the west of
The digital raster Graphic (DRG)
of the 1985 provisional edition of the U.S. Geological Survey (USGS) 7.5’
quadrangle provides the base map on top of which geospatial vector format geologic units layers, vector format unit boundaries/contacts,
collected and analyzed sample location layers, faults, and volcanic centers layers have been placed. The geologic units and their boundaries
were determined based on a combination of field observations and hand sample, thin-section, and geochemical analyses and observations
of 153 samples collected from
within the
adjacent quadrangles. Although the chemistry data and thin-section observations were used in creating the map, the units are meant to be
field-mappable, that is, recognizable by the study of outcrops in the field.
The various layers (geologic units, samples, etc.) of the map were digitized in MapInfo Professional v.7.0 from drawings on paper
quadrangles, UTM coordinates, or maps from student research reports. Rock samples were collected and analyzed by x-ray fluorescence
(XRF) intermittently between 1984 and 2004. Several samples were also dated using K-Ar or 40Ar/39Ar dating methods. The major and
trace elemental chemistry data and ages are made available in the samples table of this data set.
Purpose: These data were collected and compiled in order to better understand the local geology and geologic history, to create a field –
mappable
geologic map of the
O-07-13, and to make available the collected chemical and age information that may be useful in various forms of study of this volcanic
region. The map is intended for a diverse audience with varying amounts of geologic understanding. This is one of a series of geologic
maps of USGS 7.5’ quadrangles in
the south-central region of
Mineral Industries.
Supplemental Information: There are several different files and file formats in this data set. The geologic units/formations table, unit
boundaries/contacts table, samples table, faults table, and volcanic centers table were created in MapInfo Professional version 7.0 and
the .TAB files can be opened using MapInfo software. These data were later translated to ESRI compatible file formats using the
MapInfo Universal Translator extension. These translated files were then arranged and setup to properly display the data when opened
in the ESRI ArcMap software.There is a MapInfo workspace (.WOR) file that opens the georeferenced USGS Lake of the Woods
South 7.5’ quadrangle raster image and the other Lake of the Woods South tables mentioned above (LOTWS.WOR). There is also an
ArcMap file (.MXD) which contains the georeferenced
USGS
boundaries, samples, faults, and volcanic centers shapefiles and accompanying attribute tables.
Time Period of Content:
Multiple Dates/Times:
Calendar Date: 1984, 1986, 1991, 1992, 1994, 1998, 1999, 2000, 2004, 2007
Currentness Reference: ground condition except 2007 is publication date
Status:
Progress: Complete
Maintenance and Update Frequency: Unknown
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -122.25
East Bounding Coordinate: -122.125
North Bounding Coordinate: 42.375
South Bounding Coordinate: 42.25
Keywords:
Theme:
Theme Keyword Thesaurus: none
Theme Keyword: geologic map
Theme Keyword: map of surface geology
Theme Keyword: surface geology
Theme Keyword: volcanoes
Theme
Keyword:
Theme Keyword: volcanic flows
Theme Keyword: lava flows
Theme Keyword: units
Theme Keyword: formations
Theme Keyword: formation boundary
Theme Keyword: contact
Theme Keyword: samples
Theme Keyword: geochemistry
Theme Keyword: chemistry
Theme Keyword: age-dated
Theme Keyword: volcanic center
Theme Keyword: geospatial vector format
Theme Keyword: digital raster graphic
Theme Keyword: drg
Theme Keyword: topographic map
Theme Keyword: topographic quadrangle
Theme Keyword: USGS quadrangle
Theme Keyword: Open-File Report
Theme Keyword: Open-File Report 07-13
Place:
Place Keyword Thesaurus: none
Place
Keyword:
Place
Keyword: south-central
Place
Keyword:
Place
Keyword:
Place
Keyword:
Place
Keyword:
Place
Keyword:
Place
Keyword:
Place
Keyword:
Place
Keyword:
Place
Keyword:
Place Keyword: High Knob
Place
Keyword:
Place
Keyword:
Place Keyword: Ichabod Spring
Place
Keyword:
Place Keyword: Cascades
Place
Keyword:
Place Keyword: High Cascade volcanoes
Place
Keyword:
Stratum:
Stratum Keyword Thesaurus: none
Stratum Keyword: surface
Stratum Keyword: surface geology
Stratum Keyword: surficial
Stratum Keyword: surficial formations
Stratum Keyword: surface formations
Stratum Keyword: upper strata
Stratum Keyword: surface strata
Stratum Keyword: volcanic strata
Stratum Keyword: volcanic
Stratum Keyword: surficial volcanic deposits
Stratum Keyword: lava flows
Stratum Keyword: surficial lava flow
Temporal:
Temporal Keyword Thesaurus: none
Temporal Keyword: 6 Ma
Temporal Keyword: 6 million years
Temporal Keyword: present
Temporal Keyword: 6 million years to the present
Temporal Keyword: late Cenozoic
Temporal Keyword: upper Cenozoic
Temporal Keyword: Tertiary to Quaternary
Temporal Keyword: Late Tertiary to Quaternary
Temporal Keyword: Upper Tertiary to Quaternary
Temporal Keyword: Neogene to Quaternary
Temporal Keyword: Middle Neogene to Quaternary
Temporal Keyword: Miocene
Temporal Keyword: Pliocene
Temporal Keyword: Pleistocene
Temporal Keyword: Holocene
Temporal Keyword: Miocene to Holocene
Temporal Keyword: Late Miocene to Holocene
Temporal Keyword: Upper Miocene to Holocene
Access Constraints: none
Use Constraints: Acknowledgement of the authors and the Oregon Department of Geology and Mineral Industries would be appreciated in products
Derived from these data.
Point of Contact:
Contact
Person Primary:
Contact Address:
Address Type: mailing and physical address
Address:
City:
State or
Province:
Postal Code: 17604
Contact Voice Telephone: 1-717-291-3818
Contact Electronic Mail Address: stan.mertzman@fandm.edu
Contact Instructions: contact via electronic mail is preferred
Browse Graphic:
Browse Graphic File Name: LOTWSMap30x36.pdf
Browse
Graphic File Description: The
LOTWSMap30x36.pdf file contains the Preliminary Geologic Map of the
South 7.5’ Quadrangle of Open-File Report 07-13. This map was made from the data provided in this data set. The basic image in this
map (the 1988 USGS
symbols, and the faults) was created in MapInfo Professional version 7.0 using the data available in this data set
(LOTWSQuadforTransparent.TAB, LOTWSUnits.TAB, LOTWSUnitBounds.TAB, LOTWSFaults.TAB, and LOTWSSamples.TAB).
This image was exported from MapInfo Professional v. 7.0 as a Photoshop Document (.PSD) at a zoom of 1 inch = 1.4 miles, a
window size of 8 miles (in the export options, the actual window size was doubled from 5.72 inches to 11.44 inches), and with a
resolution of 600 pixels per inch. The colors of the resulting .PSD file were adjusted in Adobe Photoshop CS3 to match USGS CMYK
color standards. The image was then opened in Adobe Illustrator CS3 where its size was increased by 184.7999% to make the map scale
1:24,000. The sample’s map numbers, the formation labels, and the rest of what is seen on the map, such as the time rock chart and the
legend, were added to the map in Adobe Illustrator CS3. The resulting 30 inch x 36 inch Adobe Illustrator image was saved as a Portable
Document Format (.PDF) file and the result is the image of the geologic map seen in the file LOTWSMap30x36.pdf.
Browse Graphic File Type: PDF
Native Data Set Environment:
The majority of the data files in the data set used to make the
Preliminary Geologic Map of the
South 7.5’ Quadrangle of Open-File Report 07-13 were originally created using MapInfo Professional software version 7.0 running under a
Microsoft Windows 2000 Professional operating system. The data that were digitized in this environment were the geologic formations, the
formations boundaries, the sample locations, the fault, and the volcanic centers layers. The USGS 7.5’ Lake of the Woods South quadrangle
digital raster graphic (drg) was obtained from an external source and was produced in a different environment. However, in order to make a
version of this USGS quadrangle drg that would make its white and green areas transparent (so that the map could overlay the formations layer
and the formations could show through) the digital USGS quadrangle drg was modified from its original copy. This modification was done
using Adobe Photoshop version 5 and the resulting image of the quadrangle was manually georeferenced in MapInfo Professional version 7.0.
The data were at times accessed and modified in MapInfo Professional version 7.0 running under a Microsoft XP operating system. The data
from the Lake of the Woods South quadrangle samples table have been exported from MapInfo Professional version 7.0 at least one time and
opened in Microsoft Excel for addition or modification of certain attributes, particularly chemistry data. The Microsoft Excel file was then
reopened in MapInfo Professional version 7.0. The files of this data set have been saved and backed-up on various hard drives at various times.
The most up-to-date MapInfo
Professional formatted files (
After the data set had been produced in MapInfo Professional version 7.0, the files were converted using MapInfo’s Universal Translator
extension to produce files that could be opened with ESRI ArcMap software version 9.2. This was done by converting the MapInfo TAB files
into ESRI SHP format files. The USGS quadrangle drg was reopened and georeferenced anew within ESRI ArcMap. Further modification of
the data files occurred within ESRI ArcMap, such as adjustment of attribute names in the attribute table, adjustment of symbol shapes and
colors, and setting of the formation regions’ colors. The ESRI-formatted files (MXD, DBF, PRJ, SBN, SBX, SHP, SHX, AUX, RRD,
TFW, TIF, TFWX, and XML) have a total size of 163 MB.
Data Quality Information
Attribute Accuracy:
Attribute Accuracy Report: The attribute accuracy was tested in several ways. For sample, formation boundary, and volcanic center location
attributes (UTM coordinates), accuracy was assessed by comparison of on-screen representations of the location (digital maps on the
computer screen) to hard copy versions (hand drawn or similarly-demarcated locations and boundaries on top of paper USGS
quadrangles). On
several occasions, the digitized versions of the
with the symbol locations and formation boundaries demarcated. The print-out was then assessed by the chief geologist of the project,
with which their location on the map was determined. The precision reflects the values that were assigned using MapInfo Professional
verion 7.0’s Coordinate Extractor extension after manual
placement of the sample locations on the drg of the
USGS 7.5’
Woods South quadrangle based on comparison with the original paper quadrangles on which locations were drawn, or in some cases,
based on previously-rounded (to the nearest 10 m) UTM coordinates for samples not shown on the original paper map(s). The accuracy
of the locations drawn on the original paper maps may vary. Prior to the year 2000, sampling locations were originally determined by
use of a Brunton compass in the field and these data were later translated to the 1:24,000 USGS 7.5’ quadrangles using plastic overlay
cards marked with 1:24000 scale UTM coordinate grids or tick marks at relevant, repeated intervals. After the year 2000, Magellan GPS
units were used to determine the location of collected samples in the field, and again these coordinates were placed on the 1:24,000
scale USGS quadrangles using the appropriate plastic overlay card with UTM units.
The Public Land Survey System
(PLSS) attributes (¼ of ¼ Section, ¼ Section, Section, Township, and Range) in
the
Woods South samples table were created in a manner so as to be as accurate as possible, but have not been tested for accuracy beyond
the checks that occurred during their production. The Township and Range attribute values were assigned by selection of all samples
that occurred within either manually created or downloaded polygons of the Township and Range boundaries. Samples near a Township
or Range grid line were more carefully studied on the screen to check that the sample really did lie within the supposed Township. The
Section attribute was assigned
based on a sample’s location in relation to the PLSS section grid as
represented on the drg of the
the Woods South quadrangle in MapInfo.
The ¼ of ¼ Section and ¼ Section attributes were assigned for each sample based on downloaded grids which displayed the boundaries
of the ¼ of ¼ Sections and ¼ Sections of Townships. Because the Section and Township boundaries did not always line up perfectly
with those of the underlying quadrangle DRG, at times attributes of samples close to lines in this grid had to be assigned based on mental
adjustments or at times, the use of a ruler held up to the screen, by a technician. For this reason, the accuracy of the ¼ of ¼ Section and
¼ Section attributes may be questionable in some cases, particularly in those samples which lie close to the boundaries which demarcate
these location descriptors.
The accuracy of a sample’s Unit attribute was tested by a visual check of the sample’s location in relation to the unit boundaries as
displayed in MapInfo Professional version 7.0.
The accuracy of the chemical data is dependent on many factors not discussed here. The samples were analyzed by x-ray fluorescence
(XRF) at various times and possibly by different machines. All that will be said is that the accuracy of the XRF chemical data is
monitored and assessed by using an instrument monitor (to account for local climate and machine conditions on the day of measurement),
by running several well-measured standards in every batch, and by analyzing the totals counts. That the chemical attributes of each sample
in the data table match the originally assigned data from the XRF instrument was tested by the comparison of the sample chemistry table
to the original Excel data files that contained the chemistry information provided by the XRF spectrometer. All of the chemical data were
derived from these original Excel files, except for several of the age-dated samples, which may have values copied from a previous
publication by Stanley A. Mertzman. That the chemistry of the dated samples was correctly copied into the data table was checked by
comparison of the digital data to the data printed in the publication.
The colors of the units are consistent between adjacent quadrangles mapped in this project and were created as the RGB (only color mode
allowed in MapInfo Professional version 7.0) equivalents of standard USGS CMYK colors.
Logical Consistency Report: The boundaries of the Lake of the Woods South unit polygons within the formations table (LOTWSFormations) have
been checked for self- intersections, overlaps, and gaps using MapInfo Professional version 7.0 and no such problems were detected. The edges
of unit polygons have also been checked against those mapped as part of this project, but available in other data sets. All of the boundaries were
found to fit and all of the points at the quadrangle corners were found to align perfectly. The formations boundaries polylines (from the file
LOTWSFormationBounds) were drawn in a separate layer on top of the formations layer using the trace function that is available in the MapInfo
Professional version 7.0 software.
There are two samples with duplicate coordinates in the Lake of the Woods South samples data table (LOTWSSamples) due to the collection of
more than one sample from the same location or possibly from multiple analyses of the same sample.
Completeness Report: All field-mappable units and unit boundaries in the USGS 7.5’ Lake of the Woods South quadrangle have been mapped. At least
one sample (not necessarily within
the USGS
Qs, and Qg, has been age-dated. All known faults and volcanic centers within the Lake of the Woods South quadrangle have been mapped and
the MapInfo layers of these features have been included in this data set. All samples known to have been collected within this quadrangle and
analyzed by x-ray fluorescence (XRF) by Professor Stanley A. Mertzman, his colleagues, and students have been mapped. All chemistry results
from the XRF analyses have been included in the attribute table of the samples data file (LOTWSSamples). All map numbers, sample numbers,
ages (applicable only to dated samples) in millions of years (Ma), Public Land Survey System (PLSS: ¼ of ¼ Section, ¼ Section, Section,
Township, and Range according to
the
membership, and lithology (based on the total alkalis versus silica (TAS) classification method for volcanic rocks described by Le Maitre (2002))
have been included in the attribute table of the samples data file. The symbol, unit name, geologic time scale age, and radiometrically-
determined age are the attributes of the Lake of the Woods South units table (LOTWSUnits).
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report: The horizontal positional accuracy of the digitized data with regard to the original paper maps
has been checked by visual comparison of the digitized sample locations, formation boundaries, fault, and volcanic centers to the
original paper maps when possible. The positional accuracy of the original sample locations on the original paper maps may vary
depending on the location-determining methods used as discussed above (Brunton compass or Magellan GPS after 2000). The
positions of the unit boundaries are approximate and their accuracy has not necessarily been field tested. Analysis of the
collected samples (chemistry, hand-sample, and thin sections) and familiarity with the area from lots of time spent in the field
by experienced geologists ought to ensure reasonable accuracy of the mapped unit boundaries, although this is not quantifiable.
Lineage:
Source Information:
Source Citation:
Originator:
Publication Date: 1985
Title: Lake of the Woods South Quadrangle:
County: 7.5 Minute Series (Topographic)
Edition: Provisional Edition 1985
Geospatial Data Presentation Form: map and raster
digital data (digital raster graphic (drg)) of map
Series Information:
Series Name:
Series Topographic Quadrangles
Series Issue:
Edition 1985: 42122-C2-TF-024
Publication Information:
Publication
Place:
Publisher:
Other Citation Details: A drg of this map can be downloaded from
the
Online Linkage: UO Libraries website:
http://libweb.uoregon.edu/dc/24k_lookup/displaymap.php?ohio_code=42122c2
displaymap.php?ohio_code=42122c2
Source Scale Denominator: 24,000
Type of Source Media: Paper and Online
Source Time Period of Content:
Time Period Information:
Multiple Dates/Times:
Calendar Dates: 1980, 1982, 1985
Source Currentness Reference: 1980 corresponds to the year in which aerial photographs were taken, the map was field checked
in 1982, and the map was edited and published in 1985. The year of production of the particular drg used in the data set
is not currently known.
Source Citation Abbreviation: 42122c2
Source Contribution: The USGS Lake of the Woods South 7.5 minute paper quadrangle was used as the base map on which the
geology of the quadrangle was mapped by Stanley A. Mertzman, his colleagues, and students. A downloaded drg of the
Lake of the Woods South 7.5 minute quadrangle was used as the base map for this data set onto which the sample
locations, units, and volcanic centers were copied (digitized) from a paper version (or versions) of the map(s) produced
by the geologists involved in this project.
Process Step:
Process Description: The first step in the production of this data set was the collection of rock samples and observations from the field.
The samples’ chemistries were determined by x-ray fluorescence spectroscopy. The hand samples were carefully analyzed and
described. Thin sections of the rocks allowed further description of certain samples.
A sample’s collection location was determined in the field using a Brunton compass prior to 2000, and with a Magellan GPS unit
after 2000. The sample locations were marked on paper versions of the USGS 7.5’ Lake of the Woods South quadrangle. These
locations were digitized using a georeferenced (to the North American Datum of 1927 (NAD 27) zone 10 horizontal datum) drg
of the quadrangle in MapInfo Professional version 7.0 by placing a point (node) in a layer above the drg at the location identical
to the sample’s location on the papermap. This process was the first step in the production of the Lake of the Woods South
samples table (LOTWSSamples), for it produced point data from which the UTM coordinates could be extracted to the attribute
table.
The LOTWSSamples attribute table was exported at least one time to Microsoft Excel, where other sample attributes were added
and or modified (such as lithology and chemistry data). These Excel spreadsheets were then imported back into MapInfo
Professional version 7.0 and the previously extracted UTM coordinates were used to re-plot the sample locations on top of the
quadrangle drg.
The drg of the quadrangle was also used in assigning
the
The combination of the analyses of collected samples and familiarity with the area from a lot of time spent in the field
allowed Stanley A. Mertzman to discriminate between and determine the units present within the Lake of the Woods South
quadrangle and to draw the approximate locations of their boundaries on the paper USGS 7.5’ topographic maps. These
boundaries were then digitized in the same manner as the sample locations, by copying their locations from on the paper map to
a MapInfo layer on top of a drg of the same map (USGS 7.5’ Lake of the Woods South quadrangle/ 42122c2). This was done
using the polygon tool in MapInfo Professional version 7.0. The boundary of the unit on the map (contact) was digitized as the
boundary of the polygon in MapInfo. The unit polygons were colored based on RGB equivalents of standard USGS CMYK
colors. The unit ages, names, and symbols (abbreviated names) were added to the attribute table at a later stage of the process.
It was decided that a separate layer (file) should be made for the unit boundaries (contacts) within the quadrangle because the
edges of the unit polygons did not necessarily correspond to the actual unit boundaries. The edges of the unit polygons were
limited by the quadrangle boundaries, so although many units extend beyond the boundaries of the Lake of the Woods South
quadrangle, the polygons for this data set were limited to the area of the quadrangle.
In order to make a layer (LOTWSUnitBounds) that corresponded to the actual unit boundaries (surface contacts between two
rock units), the true unit boundaries (not those cut off at the quadrangle’s edges) were made by tracing (using MapInfo’s trace
function) all of the unit polygons’ edges, except those that corresponded with the 4 sides of the quadrangle. This process created
the polylines that now represent the unit boundaries in this data set.
The volcanic centers’ locations were originally determined from field observations and sample analyses. Their locations were
marked on a paper version of the quadrangle with temporary stickers and then digitized by copying the location to the identical
spot on the drg of the quadrangle.
The fault’s location was digitized as polylines by the copying of its location from a paper map.
After the creation of final forms of all of the necessary files in MapInfo, the MapInfo Universal Translator Extension was used
to convert the MapInfo-formatted data set to ESRI-format files. This involved converting the mapinfo TAB files of the unit
polygons, unit boundaries polylines, sample points, fault polylines, and volcanic center points to shapefiles (SHP). These files
were opened and adjusted in ESRI ArcMap version 9.2.
The digital versions of the sample collection locations; units and unit boundaries; and the volcanic centers locations were checked
by visual comparison of the digital data on the computer screen (in MapInfo) or on printed copies to the original source paper
maps and final printed or digital (PDF) versions of the resulting maps were assessed by the chief geologist of this project,
Source Used Citation Abbreviation: 42122c2
Process Date: 2007
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Isaac Weaver
Contact Position: Research Assistant
Contact Address:
Address Type: mailing and physical address
Address: Isaac Weaver,
City:
State or
Province:
Postal Code: 17604
Contact Voice Telephone: Unavailable
Contact Electronic Mail Address: iweaver@fandm.edu
Indirect Spatial Reference: This data set contains files with point data locations at which rock samples were collected from outcrops, polygons of
the geologic units, polylines of the formation boundaries (contacts), polylines of a fault, and volcanic center locations for the
Geological Survey 7.5 minute Lake of the Woods South quadrangle.
Direct Spatial Reference Method: Point, Vector, and Raster
Horizontal Coordinate System Definition:
Planar:
Grid Coordinate System:
Grid Coordinate System Name: Universal Transverse Mercator
Universal Transverse Mercator:
UTM Zone Number: 10
Transverse Mercator:
Scale
Factor at
Longitude
of
Latitude of Projection Origin: 0.000000
False Easting: 500000.000000
False Northing: 0.000000
Planar Coordinate Information:
Planar Coordinate Encoding Method: coordinate pair
Coordinate Representaion:
Abscissa Resolution: 0.01
Ordinate Resolution: 0.01
Planar Distance Units: meters
Geodetic Model:
Horizontal Datum Name: North American Datum of 1927
Ellipsoid Name: Clarke 1866
Semi-major Axis: 6378206.4
Denominator of Flattening Ratio: 294.9787
Detailed Description:
Entity Type:
Entity Type Label: Unit
Entity Type Definition: A rock unit (or just unit), with regard to this data set, is a body of rock with a limited range of lithological
characteristics (as determined by analyses of outcrops and samples in the field and in the laboratory) that can be
distinguished from other bodies of rocks by observations made in the field (such as analysis of outcrops or hand-samples
collected from them). That is to say, a unit is field-mappable according to the definition used in the creation of this data set.
Nevertheless, the chemistry data and other observations not possible in the field were still considered in determining and
discriminating the units. In the Lake of the Woods South quadrangle, a unit may represent one or more volcanic flows, vent
deposits, quaternary alluvium and/or colluvium, or quaternary lacustrine deposits. A unit has an age (or age-range), which has
been determined by dating of collected samples. It should be noted that the vent deposit units (Qbv) may display similar
macroscopic lithologies, but are perhaps best described as sub-units of the units in which they are found. Samples collected
from these deposits are considered a part of the unit in which the vent deposits are found. Detailed descriptions of the units
found within the Lake of the Woods South quadrangle are found in the Open-File Report O-07-13 (Mertzman et al., 2007).
In this data set, the units are colored polygons with edges placed at the approximate locations of the contacts.
Entity
Type Definition Source: See Mertzman et al. (2007)
for detailed descriptions of the units found within the
South quadrangle.
Attribute:
Attribute Label: Symbol
Attribute Definition: The symbol is a form of shorthand text, specific to a
unit, that is created by combining age and lithology information with an abbreviated form of the unit’s name. The symbol
attribute is meant to be displayed on the final geologic map to save space while identifying the unit, or it can be displayed
when viewing the data on a computer. It is intended that the symbol convey age, lithology, and unit name information. The
first letter is capitalized and represents the period-age of the formation (T=Tertiary and Q=Quaternary). If the first letter of
the symbol is a capital T, then the second letter represents the epoch-age of the formation (p=Pliocene and m=Miocene). It
should be noted that these first two letters only represent the oldest dated age of the formation. Therefore, a unit’s age may
span from period to period or epoch to epoch, but this cannot be discerned from the symbol. The remaining letters in the
symbol indicate the lithology of the formation and its name. The lithology (b=basalt, ba= basaltic andesite, and a=andesite,
for volcanic units) comes first after the age information in the abbreviation of the unit’s name.
Attribute Definition Source: None
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: Qal
Enumerated Domain Value Definition: Alluvium (Holocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Qg
Enumerated Domain Value Definition: Undifferentiated colluvium and alluvium (Holocene and Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Qs
Enumerated Domain Value Definition: Lacustrine deposits (Holocene and Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007)
Enumerated Domain:
Enumerated Domain Value: Qbv
Enumerated Domain Value Definition: Basaltic to basaltic andesite vent deposits (Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Qabm
Enumerated
Domain Value Definition: Andesite of
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Qbbb
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Qbaa
Enumerated Domain Value Definition: Basaltic Andesite of Aspen Butte (Lower to Middle Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Qbah
Enumerated Domain Value Definition: Basaltic Andesite of High Knob (Lower Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Qbbp
Enumerated Domain Value Definition: Basalt of Buck Peak (Lower Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Qbbl
Enumerated Domain Value Definition: Basalt of Buck Lake (Lower Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Qawp
Enumerated Domain Value Definition: Andesite of Whiteface Peak (Lower to Middle Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Qbams
Enumerated Domain Value Definition: Basaltic Andesite of Muddy Spring (Upper Pliocene to Lower
Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Tpbas
Enumerated
Domain Value Definition: Basaltic Andesite of
Lower Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al. 2007).
Enumerated Domain:
Enumerated Domain Value: Tpbtc
Enumerated Domain Value Definition: Basalt of Tunnel Creek (Upper Pliocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al. 2007).
Enumerated Domain:
Enumerated Domain Value: Tparc
Enumerated Domain Value Definition: Andesite of Rainbow Creek (Middle to Upper Pliocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al. 2007).
Enumerated Domain:
Enumerated Domain Value: Tpais
Enumerated Domain Value Definition: Andesite of Ichabod Spring (Middle Pliocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Tmaob
Enumerated Domain Value Definition: Andesite of Old Baldy East (Upper Miocene).
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Attribute:
Attribute Label: Name
Attribute Definition: The Name attribute represents the name of unit of which the entity is a part. The name combines information
on the lithology of the unit with a geographic feature located within or near the unit’s boundary, such as a mountain or a
body of water. Detailed descriptions of the units found within the Lake of the Woods South quadrangle are available in
Open-File Report O-07-13 (Mertzman et al., 2007).
Attribute Definition Source: See Mertzman et al. (2007)
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: Alluvium
Enumerated Domain Value Definition: Unconsolidated sediment found in close proximity to modern drainages.
Holocene in age.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Undifferentiated colluvium and alluvium
Enumerated Domain Value Definition: Unconsolidated sediment whose origin is related to glacial activity.
Holocene and Pleistocene in age.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Lacustrine deposits
Enumerated Domain
Value Definition: Unconsolidated
sediment found in association with the
enclosed basin. Holocene and Pleistocene in age.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Basaltic to basaltic andesite vent deposits
Enumerated Domain Value Definition: Poorly lithified to unconsolidated lapilli to ash-sized cinders black to
brown to red in color with lesser amounts of similarly colored lava spatter, bombs, and scoria. These
deposits mark volcanic vents areas that are often cinder cones. Pleistocene in age.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated
Domain Value: Andesite
of
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated
Domain Value: Basalt of
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated
Domain Value: Basaltic Andesite of Aspen
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Basaltic Andesite of High Knob
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated
Domain Value: Basalt of
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated
Domain Value: Basalt of
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated
Domain Value: Andesite
of
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Basaltic Andesite of Muddy Spring
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated
Domain Value: Basaltic Andesite of
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Basalt of Tunnel Creek
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Andesite of Rainbow Creek
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Andesite of Ichabod Spring
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Enumerated Domain:
Enumerated Domain Value: Andesite of Old Baldy East
Enumerated Domain Value Definition: See Mertzman et al. (2007) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-07-13 (Mertzman et al., 2007).
Attribute:
Attribute Label: Age_Geologic_Time_Scale
Attribute Definition: The Age_Geologic_Time_Scale represents
the age of a unit in terms of the “Stage Age” (convention not completely followed, only Lower, Middle, and Upper are used
as classes in this naming category) and “Series Epoch” classifiers of the 2007 International Stratigraphic Chart (International
Commission on Stratigraphy, 2007) as defined by dates calculated by Gradstein et al. (2004). The attribute value was
determined by a comparison of a unit’s dated age(s) to the stratigraphic age boundaries in the 2007 International Stratigraphic
Chart (International Commission on Stratigraphy, 2007). A range of geologic time scale ages may be provided for a unit due
to a range of ages calculated for one or more samples therein by K-Ar or 40Ar/39Ar dating methods. This attribute provides a
low resolution representation of the age of a unit.
Attribute Definition Source: See Mertzman et al. (2007), International Convention on Stratigraphy (2007), and Gradstein et al. (2004)
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: Holocene
Enumerated Domain Value Definition: < 0.0115 Million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004)., International Convention on Stratigraphy
(2007), and Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Upper Pleistocene
Enumerated Domain Value Definition: 0.126- 0.0115 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004)., International Convention on Stratigraphy
(2007), and Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Middle Pleistocene
Enumerated Domain Value Definition: 0.781 – 0.126 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004)., International Convention on Stratigraphy
(2007), and Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Lower Pleistocene
Enumerated Domain Value Definition: 1.806 - 0.781 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004)., International Convention on Stratigraphy
(2007), and Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Pleistocene
Enumerated Domain Value Definition: 1.806 – 0.0115 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004)., International Convention on Stratigraphy
(2007), and Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Upper Pliocene
Enumerated Domain Value Definition: 2.588 – 1.806 million years ago
Enumerated Domain Value Definition Source: Gradstein et al. (2004)., International Convention on Stratigraphy
(2007), and Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Middle Pliocene
Enumerated Domain Value Definition: 3.600 – 2.588 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004)., International Convention on Stratigraphy
(2007), and Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Lower Pliocene
Enumerated Domain Value Definition: 5.332 – 3.600 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004)., International Convention on Stratigraphy
(2007), and Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Upper Miocene
Enumerated Domain Value Definition: 11.608 – 5.332 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004)., International Convention on Stratigraphy
(2007), and Mertzman et al. (2007)
Attribute:
Attribute Label: Age_Ma
Attribute Definition: The Age_Ma attribute describes the absolute age or age-range of a unit in millions of years as determined
by the dating of collected rock samples with K-Ar or 40Ar/39Ar methods. The values are presented with the calculated ages
and their error ranges. All units have been age-dated using either of the two aforementioned radiometric dating methods,
except for the Qal (Alluvium), Qg (Undifferentiated colluvium and alluvium), and Qs (Lacustrine deposits). The Range
domain described below pertains to the radiometrically dated samples. The value for the Qg and Qs units is “unknown
Quaternary
(<1.806 Ma).” The value for the Qal unit is
“unknown Holocene (<0.0115 Ma).” The Qbv unit on
the
the Woods South 7.5’ quadrangle is found within the Qbbb unit and samples collected from Qbv are considered part of
the Qbbb unit. Therefore, the Qbv has been tentatively assigned the same age as the Qbbb unit, although no samples found
in the Qbv of Qbbb have been radiometrically age-dated.
Attribute Definition Source: See Mertzman et al. (2007)
Attribute Domain Values:
Range Domain:
Range Domain Minimum: <0.0115 Ma
Range Domain Maximum: 5.77 +/- 0.09 Ma
Attribute Units of Measure: Millions of years (Ma)
Detailed Description:
Entity Type:
Entity Type Label: Unit Boundary
Entity Type Definition: A unit boundary is the same as a contact. It is the ground-surface (or its trace on the surface, if
buried/concealed) boundary between two rock units. In this data set, they are polylines traced on the unit polygon
boundaries (except at those that corresponded with the edges of the quadrangle). The contacts have been approximately
located. The formation boundary entities contain no attribute information.
Entity Type Definition Source: None
Attribute:
Attribute Label: LOTWSUnitBounds
Attribute Definition: This attribute contains no information and was created by MapInfo Professional version 7.0 when
the polylines were created with that program. Each row in this attribute column corresponds to a polyline within the
data set.
Attribute Definition Source: None
Detailed Description:
Entity Type:
Entity Type Label: Sample
Entity Type Definition: A sample, with regard to this data set, is a field-collected rock specimen from an in situ outcrop (lava
flows or vent
deposits) located within the
representative suite of samples for each unit. A sample may have been apportioned for the following possible types of
analysis: hand-sample analysis with possible use of a hand lens and other tools; chemical analysis by x-ray fluorescence
spectroscopy (all samples); thin section analysis; age-dating by either K-Ar or 40Ar/39Ar methods. Samples can be displayed
as point data.
In the LOTWSSamples files, sample collection locations are indicated with either a black triangle or with a yellow square
with a black outline. The black triangles represent samples for which there is available chemistry data in the attributes table.
The yellow squares represent samples that have been age-dated by K-Ar or 40Ar/39Ar dating methods and also have chemistry
data in the data table (attribute table).
Entity Type Definition Source: See Mertzman et al. (2007)
Attribute:
Attribute Label: Map_No
Attribute Definition: The Map_No is the map number. It was assigned sequentially to all of the samples after they were organized
by age, formation, and silica content. The samples and their data were organized first by the formation, from oldest to
youngest formation. Within each formation the data were further organized by placing age- dated samples before samples
that were not age-dated. The age-dated samples for each formation were arranged by silica content, from lowest to highest
silica content. Then the non-age-dated samples for each formation were arranged by silica content, from lowest to highest.
After the data were organized, the map numbers were assigned sequentially down the data table from 1 to 153.
Attribute Definition Source: None
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 1
Range Domain Maximum: 153
Attribute:
Attribute Label: Sample_No
Attribute Definition: The Sample_No is the combination of numbers and possibly letters that was assigned to a sample when it
was collected in the field, or shortly thereafter. The letters, if present indicate the initials of the person who collected the
sample and the first two numbers represent the last two digits of the year in which the sample was collected. After the first
two numbers is a dash followed by a unique number that indicates a sample’s place in the order of collection for a particular
year.
Attribute Definition Source: None
Attribute Domain Values:
Unpresentable Domain: The values of this attribute were created systematically, but they are not all numerical and there is
no very easy way to describe the domain of these values without creating a sizeable list of the actual values. It is best
to understand how the Sample_No attribute was assigned as discussed in the Attribute Definition above.
Attribute:
Attribute Label: KAr_Age_Ma
Attribute Definition: The KAr_Age_Ma is a sample’s absolute age in millions of years as determined by K-Ar or 40Ar/39Ar dating
methods. Not all samples collected in the Lake of the Woods South quadrangle have been age-dated. Also provided is the
error range of the dated age of a sample.
Attribute Definition Source: Consult Mertzman et al. (2007)
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.33 +/- 0.12
Range Domain Maximum: 3.32 +/- 0.27
Attribute Units of Measure: Millions of years (Ma)
Attribute:
Attribute Label: Qtr_of_Qtr
Attribute Definition: The Qtr_of_Qtr attribute concerns the quarter-quarter section classifier of the Public Land Survey
System (PLSS). This attribute describes in what quarter (NW, NE, SE, SW) of a quarter section of a township a sample
was collected.
All Township descriptors are according to the grid defined by the Willamette
Meridian and
Base Line of the PLSS.
Attribute Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
and http://www.blm.gov/or/landrecords/legaldescrip.php
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: NW
Enumerated Domain Value Definition: The northwest quarter of a quarter section of a township.
Enumerated Domain
Value Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
Enumerated Domain:
Enumerated Domain Value: NE
Enumerated Domain Value Definition: The northeast quarter of a quarter section of a township.
Enumerated Domain
Value Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
articles/boundaries/a_plss.html
Enumerated Domain:
Enumerated Domain Value: SE
Enumerated Domain Value Definition: The southeast quarter of a quarter section of a township.
Enumerated Domain
Value Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
Enumerated Domain:
Enumerated Domain Value: SW
Enumerated Domain Value Definition: The southwest quarter of a quarter section of a township.
Enumerated Domain
Value Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
Attribute:
Attribute Label: Qtr_of_Sec
Attribute Definition: The Qtr_of_Sec attribute concerns the quarter section classifier of the (PLSS). This attribute
describes in what quarter section (NW, NE, SE, SW) of a township a sample was collected. All Township
descriptors are according to the grid defined by the Willamette Meridian and Willamette Base Line of the PLSS.
Attribute Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
and http://www.blm.gov/or/landrecords/legaldescrip.php
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: NW
Enumerated Domain Value Definition: The northwest quarter section of a township.
Enumerated
Domain Value Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
Enumerated Domain:
Enumerated Domain Value: NE
Enumerated Domain Value Definition: The northeast quarter section of a township.
Enumerated
Domain Value Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
Enumerated Domain:
Enumerated Domain Value: SE
Enumerated Domain Value Definition: The southeast quarter section of a township.
Enumerated
Domain Value Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
Enumerated Domain:
Enumerated Domain Value: SW
Enumerated Domain Value Definition: The southwest quarter section of a township.
Enumerated Domain Value Definition
Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
Attribute:
Attribute Label: Sec
Attribute Definition: The Sec is the Section of the Township according to the PLSS grid in which the sample was collected.
The Section is “a one-square-mile block of land, containging 640 acres, or approximately one thirty-sixth of a township.
Due to the curvature of the Earth, sections may occasionally be slightly smaller than one square mile.” All Township
descriptors are according to the grid defined by the Willamette Meridian and Willamette Base Line of the PLSS.
Attribute Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
and http://www.blm.gov/or/landrecords/legaldescrip.php
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 2
Range Domain Maximum: 36
Attribute:
Attribute Label: T_S
Attribute
Definition: The T_S (Township_South)
is the value of the horizontal row of townships in the PLSS grid (
township rows that pertain to this data set are south of the Willamette Base Line of the PLSS. When combined with
the R_E (Range)
attribute value, this information provides the specific ~36 square mile
Township in the
descriptor attributes were described and discussed above.
Attribute Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
and http://www.blm.gov/or/landrecords/legaldescrip.php
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 37
Range Domain Maximum: 38
Attribute:
Attribute Label: R_E
Attribute
Definition: The R_E (Range_East)
is the value of the vertical column of townships in the PLSS grid (
township columns that pertain to this data set are to the East of the Willamette Meridian. When combined with the
T_S attribute value, this information provides the specific ~36 square mile Township in the Willamette Meridian and
Base Line defined grid of the PLSS in which the sample was collected. The other more specific PLSS descriptor
attributes were described above.
Attribute Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html
and http://www.blm.gov/or/landrecords/legaldescrip.php
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 5
Range Domain Maximum: 6
Attribute:
Attribute Label: UTM_E_m
Attribute Definition: This is the easting value in meters of a sample’s collection location according to the NAD 1927 UTM Zone
10 projection system. This value was determined with the MapInfo Professional version 7.0 Coordinate Extractor extension.
Attribute Definition Source: Consult http://erg.usgs.gov/isb/pubs/factsheets/fs07701.html
Attribute Domain Values:
Range Domain:
Range
Domain Minimum: 561,942.84
Range Domain Maximum: 571,747.91
Attribute Units of Measure: meters
Attribute:
Attribute Label: UTM_N_m
Attribute Definition: This is the northing value in meters of a sample's collection location according to the NAD 1927
UTM Zone 10 projection system. This value was determined with the MapInfo Professional version 7.0
Coordinate Extractor extension.
Attribute Definition Source: Consult http://erg.usgs.gov/isb/pubs/factsheets/fs07701.html
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 4,677,673.05
Range Domain Maximum: 4,691,273.96
Attribute Units of Measure: meters
Attribute:
Attribute Label: Unit
Attribute Definition: This is the unit, indicated by the unit’s symbol, to which a collected rock sample belongs. Samples
collected in an area of Qbv are grouped with the unit in which the Qbv is found.
Attribute Definition Source: See Mertzman et al. (2007)
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: Qabm
Enumerated
Domain Value Definition: Andesite of
Enumerated Domain Value Definition Source: See Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Qbbb
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: See Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Qbah
Enumerated Domain Value Definition: Basaltic Andesite of High Knob (Lower Pleistocene)
Enumerated Domain Value Definition Source: See Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Qbbp
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: See Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Qbbl
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: See Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Qawp
Enumerated
Domain Value Definition: Andesite of
Enumerated Domain Value Definition Source: See Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Qbams
Enumerated Domain Value Definition: Basaltic Andesite of Muddy Spring (Upper Pliocene to Lower
Pleistocene)
Enumerated Domain Value Definition Source: See Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Tpbas
Enumerated
Domain Value Definition: Basaltic Andesite of
Pleistocene)
Enumerated Domain Value Definition Source: See Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Tpbtc
Enumerated Domain Value Definition: Basalt of Tunnel Creek (Upper Pliocene)
Enumerated Domain Value Definition Source: See Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Tparc
Enumerated Domain Value Definition: Andesite of Rainbow Creek (Middle to Upper Pliocene)
Enumerated Domain Value Definition Source: See Mertzman et al. (2007)
Enumerated Domain:
Enumerated Domain Value: Tpais
Enumerated Domain Value Definition: Andesite of Ichabod Spring (Middle Pliocene)
Enumerated Domain Value Definition Source: See Mertzman et al. (2007)
Attribute:
Attribute Label: Lith
Attribute Definition: The Lith attribute is an abbreviation of the lithology of the sample according to the total alkali (Na2O + K2O
(weight%(wt%))) versus silica (SiO2 wt%) classification (TAS classification) of Le Maitre (2002). The chemistry of the
sample was determined by x-ray fluorescence (XRF) spectroscopy. Macroscopic characteristics of the various lithologies
are not discussed here.
Attribute Definition Source: See Mertzman et al. (2007) and Le Maitre (2002)
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: B
Enumerated Domain Value Definition: Basalt: a volcanic rock with a silica content of 45-52 wt% and less
less than 5 wt% total alkali (Na2O + K2O wt%) content.
Enumerated Domain Value Definition Source: See Mertzman et al. (2007) and Le Maitre (2002)
Enumerated Domain:
Enumerated Domain Value: BA
Enumerated Domain Value Definition: Basaltic Andesite: a volcanic rock with 52-57 wt% silica content and a
total alkali content of less that 5 wt% at 52 wt% SiO2 and less than 5.9 wt% at 57 wt% SiO2.
Between 52 and 57 wt% SiO2, the upper total alkali boundary increases linearly from 5 to 5.9 wt%.
Enumerated Domain Value Definition Source: See Mertzman et al. (2007), Le Maitre (2002) and
http://www.geol.lsu.edu/henry/Geology3041/lectures/02IgneousClassify/IUGS-IgneousClassFlowChart.htm.
lectures/02IgneousClassify/IUGS-IgneousClassFlowChart.htm.
Enumerated Domain:
Enumerated Domain Value: A
Enumerated Domain Value Definition: Andesite: a volcanic rock with a silica content of 57-63 wt%
and a total alkali content of less than 5.9 wt% at 57 wt% SiO2 and less than 7 wt% at 63 wt% SiO2.
Between 57 and 63 wt% SiO2, the upper total alkali boundary increases linearly from 5.9 wt% to 7 wt%.
Enumerated Domain Value Definition Source: See Mertzman et al. (2007), Le Maitre (2002), and
http://www.geol.lsu.edu/henry/Geology3041/lectures/02IgneousClassify/IUGS-IgneousClassFlowChart.htm
lectures/02IgneousClassify/IUGS-IgneousClassFlowChart.htm
Enumerated Domain:
Enumerated Domain Value: D
Enumerated Domain Value Definition: Dacite: a volcanic rock with a silica (SiO2) content of 63- ~77 wt% and a
total alkali content of less than 7 wt% at 63 wt% SiO2, less than 8 wt% at 69 wt% SiO2, and ~ 0 wt% at
~77 wt% SiO2. Between 63 and 69 wt% SiO2, the upper total alkali boundary increases linearly from 7 to
8 wt%, and then from 69 to ~77 wt% SiO2, the upper total alkali boundary of the Dacite field in the TAS
decreases linearly from 8 to ~0 wt%.
Enumerated Domain Value Definition Source: See Mertzman et al. (2007), Le Maitre (2002), and
http://www.geol.lsu.edu/henry/Geology3041/lectures/02IgneousClassify/IUGS-IgneousClassFlowChart.htm
lectures/02IgneousClassify/IUGS-IgneousClassFlowChart.htm
Attribute:
Attribute Label: SiO2_%
Attribute Definition: The weight percent (wt%) of silica (SiO2) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 46.52
Range Domain Maximum: 67.20
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: TiO2_%
Attribute Definition: The weight percent (wt%) of titanium (TiO2) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.57
Range Domain Maximum: 1.22
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: Al2O3_%
Attribute Definition: The weight percent (wt%) of aluminum (Al2O3) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 15.26
Range Domain Maximum: 19.79
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: Fe2O3_%
Attribute Definition: The weight percent (wt%) of ferric iron (Fe2O3) in the sample as calculated using results measured by
XRF spectroscopy and Iron Titration.
Attribute Definition Source: See http://fandm.edu/x7991.xml and http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.12
Range Domain Maximum: 9.12
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: FeO_%
Attribute Definition: The weight percent (wt%) of ferrous Iron (FeO) in the sample determined by Iron Titration.
Attribute Definition Source: See http://fandm.edu/x7991.xml and http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.66
Range Domain Maximum: 7.77
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: MnO_%
Attribute Definition: The weight percent (wt%) of manganese (MnO) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.07
Range Domain Maximum: 0.62
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: MgO_%
Attribute Definition: The weight percent (wt%) of magnesium (MgO) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.61
Range Domain Maximum: 9.09
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: CaO_%
Attribute Definition: The weight percent (wt%) of calcium (CaO) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 2.47
Range Domain Maximum: 11.12
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: Na2O_%
Attribute Definition: The weight percent (wt%) of sodium (Na2O) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 2.03
Range Domain Maximum: 5.67
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: K2O_%
Attribute Definition: The weight percent (wt%) of potassium (K2O) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.10
Range Domain Maximum: 1.93
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: P2O5_%
Attribute Definition: The weight percent (wt%) of phosphorous (P2O5) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.07
Range Domain Maximum: 0.38
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: LOI_%
Attribute Definition: True Loss on Ignition: the amount of weight lost or gained (weight percent (wt%)) by the sample after
heating to between 900ºC and 950ºC for one hour added to a value that accounts for the changes in weight resulting
from the oxidation of ferrous iron.
Attribute Definition Source: See http://fandm.edu/x7991.xml and http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.01
Range Domain Maximum: 3.95
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: Total_%
Attribute Definition: The total weight percent (wt%) is the sum of the weight percent values for SiO2, TiO2, Al2O3, Fe2O3,
FeO, MnO, MgO, CaO, Na2O, K2O, P2O5, and LOI.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 97.79
Range Domain Maximum: 100.94
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: Fe2O3T_%
Attribute Definition: The ferric iron content (wt%) measured by XRF spectroscopy. This is not the true amount of ferric
iron originally present in the rock sample because it also accounts for ferrous iron that was oxidized to ferric iron
during the preparation for XRF.
Attribute Definition Source: See http://fandm.edu/x7991.xml and http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 4.78
Range Domain Maximum: 10.42
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: Rb_ppm
Attribute Definition: The amount (in parts per million (ppm)) of rubidium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.4
Range Domain Maximum: 29.0
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Sr_ppm
Attribute Definition: The amount (in parts per million (ppm)) of strontium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 363
Range Domain Maximum: 1308
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Y_ppm
Attribute Definition: The amount (in parts per million (ppm)) of yttrium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 8.6
Range Domain Maximum: 41.1
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Zr_ppm
Attribute Definition: The amount (in parts per million (ppm)) of zirconium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 46
Range Domain Maximum: 183
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: V_ppm
Attribute Definition: The amount (in parts per million (ppm)) of vanadium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 54
Range Domain Maximum: 258
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Ni_ppm
Attribute Definition: The amount (in parts per million (ppm)) of nickel present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 2
Range Domain Maximum: 173
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Cr_ppm
Attribute Definition: The amount (in parts per million (ppm)) of chromium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 1
Range Domain Maximum: 422
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Nb_ppm
Attribute Definition: The amount (in parts per million (ppm)) of niobium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 1
Range Domain Maximum: 8.6
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Ga_ppm
Attribute Definition: The amount (in parts per million (ppm)) of gallium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 15.3
Range Domain Maximum: 23.2
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Cu_ppm
Attribute Definition: The amount (in parts per million (ppm)) of copper present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 9
Range Domain Maximum: 157
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Zn_ppm
Attribute Definition: The amount (in parts per million (ppm)) of zinc present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 49
Range Domain Maximum: 99
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Co_ppm
Attribute Definition: The amount (in parts per million (ppm)) of cobalt present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 6.7
Range Domain Maximum: 45
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Ba_ppm
Attribute Definition: The amount (in parts per million (ppm)) of barium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 102
Range Domain Maximum: 812
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: La_ppm
Attribute Definition: The amount (in parts per million (ppm)) of lanthanum present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 3.4
Range Domain Maximum: 24
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Ce_ppm
Attribute Definition: The amount (in parts per million (ppm)) of cesium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 2.4
Range Domain Maximum: 43.5
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: U_ppm
Attribute Definition: The amount (in parts per million (ppm)) of uranium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.3
Range Domain Maximum: 2.9
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Th_ppm
Attribute Definition: The amount (in parts per million (ppm)) of thorium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.2
Range Domain Maximum: 5.7
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Sc_ppm
Attribute Definition: The amount (in parts per million (ppm)) of scandium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 12
Range Domain Maximum: 41
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Pb_ppm
Attribute Definition: The amount (in parts per million (ppm)) of lead present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 2
Range Domain Maximum: 19
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Yb_ppm
Attribute Definition: The amount (in parts per million (ppm)) of ytterbium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.6
Range Domain Maximum: 2.82
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Be_ppm
Attribute Definition: The amount (in parts per million (ppm)) of beryllium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.6
Range Domain Maximum: 2.8
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Hf_ppm
Attribute Definition: The amount (in parts per million (ppm)) of hafnium present in the sample as measured by XRF
spectroscopy. This element was only measured for two of the samples.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 1.5
Range Domain Maximum: 3.9
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Ta_ppm
Attribute Definition: The amount (in parts per million (ppm)) of tantalum present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: <0.3
Range Domain Maximum: <0.3
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Nd_ppm
Attribute Definition: The amount (in parts per million (ppm)) of neodymium present in the sample as measured by XRF
spectroscopy. This element was only measured for two of the samples.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 9
Range Domain Maximum: 25
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Sm_ppm
Attribute Definition: The amount (in parts per million (ppm)) of samarium present in the sample as measured by XRF
spectroscopy. This element was only measured for two of the samples.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 2.45
Range Domain Maximum: 4.85
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Eu_ppm
Attribute Definition: The amount (in parts per million (ppm)) of europium present in the sample as measured by XRF
spectroscopy. This element was only measured for two of the samples.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.98
Range Domain Maximum: 1.45
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Tb_ppm
Attribute Definition: The amount (in parts per million (ppm)) of terbium present in the sample as measured by XRF
spectroscopy. This element was only measured for two of the samples.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.6
Range Domain Maximum: 0.9
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Lu_ppm
Attribute Definition: The amount (in parts per million (ppm)) of lutetium present in the sample as measured by XRF
spectroscopy. This element was only measured for two of the samples.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.32
Range Domain Maximum: 0.42
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: DatedOrNot
Attribute Definition: This attribute is only present in the ESRI Shapefile formatted Lake of the Woods South Samples
file (LOTWSSamples_point.shp). This attribute indicates if a sample was age-dated or not.
Attribute Definition Source: None
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: Y
Enumerated Domain Value Definition: The Y stands for “Yes,” meaning that this rock sample has been
age-dated by K-Ar or 40Ar/39Ar dating methods.
Enumerated Domain Value Definition Source: None
Enumerated Domain:
Enumerated Domain Value: N
Enumerated Domain Value Definition: The N stands for “No,” meaning that this rock sample has not
been age-dated with radiometric dating methods.
Enumerated Domain Value Definition Source: None
Detailed Description:
Entity Type:
Entity Type Label: Volcanic Center
Entity Type Definition: A volcanic center is a source of volcanic rocks. In other words, it is a location where subterranean magma
has erupted onto the surface. The locations of the some of the volcanic centers in the Lake of the Woods South quadrangle
were determined on the basis of vent deposits. Other observations made in the field helped to locate volcanic centers where
there were no vent deposits.
In this data set, the volcanic centers are point data displayed as red triangles with a black outline.
Entity Type Definition Source: See Mertzman et al. (2007) for a description of the vent deposits.
Attribute:
Attribute Label: volcaniccenters
Attribute Definition: This attribute contains no information and was created by MapInfo Professional version 7.0 when the point
data were created with that program. Each row in this attribute column corresponds to a point that represents a volcanic
center within the
Attribute Definition Source: None
Detailed Description:
Entity Type:
Entity Type Label: Fault
Entity Type Definition: A fault is a planar fracture or area of fracture rock where there is relative movement of large bodies
of
rock. There is one prominent fault in the
relatively down-dropped block (hanging wall) to the east and the relatively up-lifted block (footwall) to the west. What is
really shown by the fault on a map is the fault trace, its location on the ground surface.
In this data set, the fault is composed of two polylines with different line styles. The dashed line with the hatch marks/ tick
marks/ bars represents the approximate location of the fault where the fault trace is buried/concealed. The solid line with
hatch marks/ tick marks/ bars represents the approximate location of the fault trace. The hatch marks/ tick marks/ bars are on
the down-dropped block (hanging wall), which is to the east of the fault.
Entity Type Definition Source: See Mertzman et al. (2007), http://volcanoes.usgs.gov/Products/Pglossary/fault.html ,
http://www.ucmp.berkeley.edu/glossary/glossary_2.html ,
http://earthquake.usgs.gov/learning/glossary.php?term=fault%20plane
,
http://www2.nature.nps.gov/geology/usgsnps/deform/ghangft.html , and http://en.wikipedia.org/wiki/Fault_(geology)
Attribute Definition Source: None
EnumeratedDomain Value: Approximate
solid line with the bars/hatches on the down-dropped block (hanging wall).
Enumerated Domain Value Definition Source: None
EnumeratedDomain Value: Concealed
a dashed line with hatch marks that lie on the down-dropped block / hanging wall.
EnumeratedDomain Value Definition Source: None
Metadata
Reference Information
ContactPosition: Research Assistant
AddressType: mailing and physical address
State or Province: Pennsylvania
ContactVoice Telephone: Unavailable
ContactElectronic Mail Address: iweaver@fandm.edu
Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata