U.S. Geological Survey 2012 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir-2012-5002_surficial U.S. Geological Survey 2012 Scientific Investigation Report 2012-5002 http://pubs.usgs.gov/sir/2012/5002/ A surficial and structural geologic map (SIR-2012-5002, fig. 2) was compiled to aid in the building of the three-dimensional geologic model. The map covers 327 square miles in north-central Oregon and south-central Washington, and completely contains the study area defined by the Mosier-Rock-Rowena Creek Watershed extents. Surficial and structural geologic maps, cross-sections, and stratigraphic interpretations of well logs from previous reports were synthesized into this compilation map (Newcomb, 1969; Swanson and others, 1981; Bela, 1982; Lite and Grondin, 1988; Kienle, 1995; and Jervey, 1996). The focus of this effort was to refine the geologic map within the study area to aid in construction of a three-dimensional geologic model to be used as the foundation for groundwater flow simulation. Areas outside of the study area boundary were given less attention. The primary sources for surficial and structural geology were Lite and Grondin (1988) and Kienle (1995). Both extents together cover 78% of the geologic model area and represent the largest scales mapped. Individually each provides significant surficial and structural detail absent in other sources. Where they overlap both maps are mostly in agreement with only subtle differences. Both Lite and Grondin (1988) and Kienle (1995) together comprise all of the major structural components represented in the geologic model with the exception of the wrench fault associated with the Maupin trend. Secondary sources for surficial and structural geology include Newcomb (1969), Swanson and others (1981), Bela (1982), and Jervey (1996). Newcomb (1969) was used to delineate alluvium, landslide deposits, glaciofluvial deposits, and Chenowith Formation material outside of the Lite and Grondin (1988) and Kienle (1995) map boundaries in Oregon. In the western portion of the map in Oregon and all of Washington, Bela (1982) was relied upon for surficial geology. Bela (1982) also provided all of the structural content outside the area covered by Lite and Grondin (1988) and Keinle (1995), with additional detail provided by Swanson and others (1981) and Jervey (1996). This geologic compilation was created to aid in construction of the geologic framework needed for modeling the Mosier Basin groundwater system. This dataset has been published in conjunction with SIR-2012-5002, Evaluation of Long-Term Water-Level Declines in Basalt Aquifers near Mosier, Oregon. These GIS files contain the surficial geology and geologic structure that are represented in figure 2 of SIR-2012-5002. Bela, J.L., 1982, Geologic and neotectonic evaluation of north-central Oregon: The Dalles 1 degree by 2 degree quadrangle: Oregon Department of Geology and Mineral Industries, Geological Map Series, GMS-27. Jervey, G.M. 1996. Transition lands study area groundwater evaluation, Wasco County, Oregon: Mosier, Oreg., Jervey Geological Consulting. Kienle, C.F., 1995, Hydrogeologic investigation transition lands study area: Report prepared for Wasco County Planning and Economic Development Office, Wasco County, Oregon, Northwest Geological Services, Inc., 49 p. plus appendices. Lite, K.E, and Grondin, G.H., 1988, Hydrogeology of the basalt aquifers near Mosier, Oregon: A groundwater resource assessment: Oregon Water Resources Department Groundwater Report No. 33, 68 p. plus appendices. Newcomb, R.C., 1969, Effects of tectonic structure on the occurrence of groundwater in the basalt of the Columbia River Group of The Dalles area, Oregon and Washington: U.S. Geological Survey Professional Paper 383-C, 33 p. Swanson, D.A., Anderson, J.L., Camp, V.E., Hooper, P.R., Taubeneck, W.H., Wright, T.L., 1981, Reconnaissance geologic map of the Columbia River Basalt Group, northern Oregon and western Idaho: U.S. Geological Survey Open-File Report 81-797, 33 p. 1969 1996 ground condition Complete None planned -121.548139 -121.161691 45.749711 45.491810 None inlandWaters geologic compilation None Mosier Creek Basin Oregon None The U.S. Geological Survey should be acknowledged as the data source in products derived from these data. U.S. Geological Survey Erick R. Burns Hydrologist mailing address

2130 SW 5th Avenue

Portland OR 97201 USA 503-251-3250 http://water.usgs.gov/GIS/browse/SIR-2012-5002_surficial_browse_graphic.jpg Illustration of data set JPEG None Unclassified None Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.4000 Attribute data are a compilation of multiple sources and are as accurate as sources allow. Data are topologically correct. Data are complete. Bela, J.L. 1982 paper1982publication dateBela (1982)Structural and surficial geology Jervey, G.M. 1996 paper1996publication dateJervey (1996)Structural and surficial geology Kienle, C.F. 1995 paper1995publication dateKienle (1995)Structural and surficial geology Lite, K.E Grondin, G.H. 1988 paper 1988 publication date Lite and Grondin (1988) Structural and surficial geology Newcomb, R.C. 1969 paper 1969 publication date Newcomb (1969) Structural and surficial geology Swanson, D.A. Anderson, J.L. Camp, V.E. Hooper, P.R. Taubeneck, W.H. Wright, T.L. 1981 paper1981publication dateSwanson and others (1981)Structural and surficial geology Digitized source maps and projected into State Plane Oregon North, NAD27 coordinates. Combined maps to create a compilation map that attempted to reconcile all sources. Lite and Grondin (1988) and Kienle (1995) were given additional weight compared to the other sources. 2007 Vector G-polygon 169 State Plane Coordinate System 1927 3601 44.333333 46.000000 -120.500000 43.666667 2000000.000000 0.000000 coordinate pair 10 10 survey feet North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 SIR-2012-5002_surficial Surficial geology of the Mosier Creek Basin U.S. Geological Survey FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. Geo_unit U.S. Geological Survey Qal Alluvium consisting of gravel, sand, silt, and clay. Can include some glaciofluvial deposits. U.S. Geological Survey Qba Andesite and basalt of Quaternary age, primarily from Mt. Hood. U.S. Geological Survey Qgf Glaciofluvial deposits of coarse, unsorted gravel, sand, and silt from the Pleistocene Missoula Floods. U.S. Geological Survey Qls Landslide deposits resulting from rock slides and block slumps. Also includes small colluvium deposits. U.S. Geological Survey QTb Olivine basalt and andesite in undifferentiated Quaternary-Tertiary volcanic units. U.S. Geological Survey Tdc Chenoweth Formation (of the Dalles Group) includes volcaniclastic and sedimentary rock with laharic deposits, tuff breccia, and fluvial deposits. U.S. Geological Survey Tf Frenchman Springs member of the CRBG. Dark gray to black, fine to medium grained, aphyric to porphyritic basalt. U.S. Geological Survey Tg Grande Ronde Formation of CRBG. Aphyric, fine grained basalt. U.S. Geological Survey Tp Pomona member of the Columbia River Basalt Group (CRBG). Gray to black, fine grained, porphyritic basalt. U.S. Geological Survey Tpr Priest Rapids member of the CRBG. Dark gray to black, fine to coarse grained basalt. U.S. Geological Survey Tr Roza member of the CRBG. Dark gray to black, medium grained, porphyritic basalt. U.S. Geological Survey Tss Conglomerate of Snipes Mountain. Weakly consolidated deposit of fluvial gravel and sand. Formed by ancestral Columbia River. U.S. Geological Survey water open water U.S. Geological Survey U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Downloadable Data Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. ESRI Shapefile WINZIP compression Winzip 5.770 http://water.usgs.gov/GIS/dsdl/sir-2012-5002_surficial.zip None. This dataset is provided by USGS as a public service. 20110314 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir-2012-5002_surficial FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998