| Preliminary Geologic Map of the Umatilla Basin, Morrow and Umatilla Counties, Oregon | |
|
Data format: Shapefile File or table name: Umatilla_Basin_Buried_Faults_polyline Coordinate system: Geographic Theme keywords: Earth Science, Geology |
|
|
Abstract:
The area of the Umatilla Basin geologic compilation map lies in northeast Oregon. Map coverage includes the entire Umatilla Basin, and the Willow Creek Basin within Morrow County. The map covers most of Morrow and Umatilla Counties, and small parts of Union and Wallowa Counties.
The Umatilla Basin in NE Oregon consists of two distinct geographic provinces. Relatively flat lowlands at elevations of 200 m along the Columbia River are flanked to the south and east by the Blue Mountains which rise to elevations of 1500 m. The lowlands are intensely farmed, and the mountain areas are largely public and private forestland. The bedrock geology of the area is dominated by lava flows of the middle to late Miocene Columbia River Basalt Group, which blanket most of the area to depths of over 1000 m. Windows of older rocks along the crest of the Blue Mountains and in deep canyons expose Paleozoic to Mesozoic intrusive and metamorphic rocks, Paleocene continental sedimentary rocks and Eocene to Oligocene volcanic and volcaniclastic rocks.
Quaternary sand and gravel deposits, chiefly outburst flood sediments from the late Pleistocene Missoula Floods and Pleistocene loess cover much of the lowlands.
The dominant structure in the area is the Blue Mountains Anticline, which arcs roughly ENE across the southern edge of the map area. Significant faulting occurs along the Blue Mountain front east of Pendleton. |
|
Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.
The area of the Umatilla Basin geologic compilation map lies in northeast Oregon. Map coverage includes the entire Umatilla Basin, and the Willow Creek Basin within Morrow County. The map covers most of Morrow and Umatilla Counties, and small parts of Union and Wallowa Counties. The Umatilla Basin in NE Oregon consists of two distinct geographic provinces. Relatively flat lowlands at elevations of 200 m along the Columbia River are flanked to the south and east by the Blue Mountains which rise to elevations of 1500 m. The lowlands are intensely farmed, and the mountain areas are largely public and private forestland. The bedrock geology of the area is dominated by lava flows of the middle to late Miocene Columbia River Basalt Group, which blanket most of the area to depths of over 1000 m. Windows of older rocks along the crest of the Blue Mountains and in deep canyons expose Paleozoic to Mesozoic intrusive and metamorphic rocks, Paleocene continental sedimentary rocks and Eocene to Oligocene volcanic and volcaniclastic rocks. Quaternary sand and gravel deposits, chiefly outburst flood sediments from the late Pleistocene Missoula Floods and Pleistocene loess cover much of the lowlands. The dominant structure in the area is the Blue Mountains Anticline, which arcs roughly ENE across the southern edge of the map area. Significant faulting occurs along the Blue Mountain front east of Pendleton.
This digital geologic compilation map was designed to bring together all of the currently available geologic data for the region and combine it into a new, seamless interpretation of the geology. The map has been generated to further our understanding of bedrock and surficial processes at work in the region and to help understand the surface water and groundwater resources. The map is designed to serve as a base layer suitable for ecosystem and mineral resource assessment and for building a hydrogeologic framework for the basin. It is not suitable for site-specific geologic evaluations.
publication date
User should use caution when overlaying other data sets and should not make legally binding decisions from this data. These data are subject to change. Acknowledgment of the Oregon Department of Geology and Mineral Industries (DOGAMI) would be appreciated in products derived from these data. Any person using the information presented here should fully understand the data collection and compilation process before beginning their analysis/use. The burden of determining fitness for use lies with the user. To avoid the risk of misinterpretation, invalid results, and erroneous conclusions, the users must consider the original map scale, collection methodology, currency of data, and any other conditions specific to every data element and each dataset as a whole. Potential users are advised to consult with DOGAMI to gain an understanding of the inherent limitations of this data set and its scope of inference. Also, the user must be aware that errors and conditions originating from physical sources involved in developing a dataset may be reflected in the data, and that the digital processing performed during preparation, storage, and transmission of the dataset may have exacerbated such errors and/or introduced additional ones. Data collected and interpreted at a variety of scales, linework was nominally drawn at a scale of 1:100,000. Most lines and polygon boundaries are inferred. Location error for observed features points, lines, and polygons is estimated at 50 m.
800 NE Oregon St, Suite 965
Data set prepared by Ian P. Madin and Ronald P. Geitgey. Metadata by Rudie Watzig. Base map is US Geological Survey 1:100,000 scale Digital Raster Graphic.
The accuracy of the attributes is unknown
Spatial data is presented in the form of points characterizing the geology only in the quadrangles. This dataset does not have topology. The geology was delineated by the geologist on a 1:24,000, 7.5-minute USGS topographic quadrangle. Check plots of the map were reviewed by the mapper and cartographer for consistency with basic geologic principles and general conformity to USGS mapping standards. This data is not field-checked and is an interpretation of the mapper. No guarantees are provided as to its accuracy.
The mapping project as originally designed has been completed for the quadrangles. The geology of the quadrangles is based on relationships gathered from outcrops, float, and rock exposure on foot or vehicle traverses. Portions of the quadrangle may not have been visited or field checked. Interpretation of the geology in the quadrangles was supplemented by examination of the land surface using digital orthophoto quadrangles with 1 m resolution, overlaid with digital line graphs of contour lines and hydrography, and printed out at 1:600 or 1:12,000 scale. Unit properties are described in the text explanation. All geospatial database elements are attributed.
The data cannot be more accurate than the USGS topographic quadrangle from which it was developed. Positional accuracy of geologic contacts vary based on the techniques and quality of mapping. Still the horizontal accuracy of the coverage should be regarded as unknown.
Digitization and compilation of existing geologic mapping, aerial photograph interpretation; iterative process. Transfer of geologic linework and point data from exiting paper and digital maps to a single digital map. Interpretation of aerial photographs to add detail and accuracy to mapped units. Description of Map Units and Correlation of Map Units Polygons, lines, and points representing geologic features and data points were hand digitized from author-prepared base-stable geologic map at 1:100,000 scale. The resultant coverages were attributed with data describing the geologic units, structures and point locations.
Dataset copied.
Internal feature number.
ESRI
Feature geometry.
ESRI
Name of Fault
Dominant style of movement on fault
compass octant of downthrown side of fault
Sense of horizontal fault motion
800 Oregon Street #5
No warranty, expressed or implied is made regarding the accuracy or utility of the data described and/or contained herein, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The Oregon Department of Geology and Mineral Industries shall not be held liable for improper or incorrect use of these data. This information may be updated without notification.
Ordering capability is available through Nature of the Northwest Information Center, 800 NE Oregon Street #5, Portland, Oregon 97232, (503) 872-2750 and a publication list is viewable at: http:/www.naturenw.org
Files for ArcGIS Desktop
Ordering capability is available through Nature of the Northwest Information Center, 800 NE Oregon Street #5, Portland, Oregon 97232, (503) 872-2750 and a publication list is viewable at: http:/www.naturenw.org
Contact The Nature of the Northwest Information Center by e-mail, phone, or letter explaining what products are needed.
800 NE Oregon St Suite 965