20240530 08473100 1.0 FGDC CSDGM Metadata FALSE MapUnitPolys 468283.822200 478895.364700 4497159.897200 4511072.918400 1 Projected GCS_North_American_1983 Linear Unit: Meter (1.000000) NAD_1983_UTM_Zone_12N <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.3.0'><WKT>PROJCS[&quot;NAD_1983_UTM_Zone_12N&quot;,GEOGCS[&quot;GCS_North_American_1983&quot;,DATUM[&quot;D_North_American_1983&quot;,SPHEROID[&quot;GRS_1980&quot;,6378137.0,298.257222101]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Transverse_Mercator&quot;],PARAMETER[&quot;False_Easting&quot;,500000.0],PARAMETER[&quot;False_Northing&quot;,0.0],PARAMETER[&quot;Central_Meridian&quot;,-111.0],PARAMETER[&quot;Scale_Factor&quot;,0.9996],PARAMETER[&quot;Latitude_Of_Origin&quot;,0.0],UNIT[&quot;Meter&quot;,1.0],AUTHORITY[&quot;EPSG&quot;,26912]]</WKT><XOrigin>-5120900</XOrigin><YOrigin>-9998100</YOrigin><XYScale>10000</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>26912</WKID><LatestWKID>26912</LatestWKID></ProjectedCoordinateSystem> 150000000 5000 20240523 11480100 20240523 11480100 20240523 Interactive Geologic Map Portal Utah Geological Survey 1594 W. North Temple Salt Lake City Utah 84116 US Local: (801) 537-3320 Toll free: (801) UTAH MAP (888) 882-4627 Online web service Browse UGS map publications and download PDFs and GIS data in the UGS Interactive Geologic Map Portal. https://geology.utah.gov/apps/intgeomap/ Natural Resources Map & Bookstore Utah Geological Survey Publisher and distributor 1594 W. North Temple Salt Lake City Utah 84116 US Local: (801) 537-3320 Toll free: (801) UTAH MAP (888) 882-4627 Monday - Friday 8 am - 5 pm Visit our Natural Resources Map & Bookstore at https://www.utahmapstore.com/ for online ordering information. LOCATION https://doi.org/10.34191/OFR-763 File Geodatabase Feature Class This map represents the geology of the Kamas 7.5' quadrangle at 1:24,000 scale. It depicts geologic formations, faults, folds, geologic attitudes, and other information. The map is accompanied by a second plate with a cross section, a stratigraphic column, a correlation chart of map units, list of map units and symbols, and a figure showing sources of previous geologic mapping. The included booklet contains introductory text, description of map units, acknowledgments, and references. <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 6 0;"><SPAN><SPAN>The Kamas 7.5</SPAN></SPAN><SPAN><SPAN>’</SPAN></SPAN><SPAN><SPAN> quadrangle is in the Wasatch Back and is centered over the north-south</SPAN></SPAN><SPAN><SPAN>-</SPAN></SPAN><SPAN><SPAN>trending Kamas Valley with foothills of the Uinta Mountains to the east and the Keetley volcanic field in the West Hills to the west. The Weber River, a major source of drinking water, flows west out of the mouth of Weber Canyon in the northeast corner of the map area. The Kamas quadrangle encompasses the cities of Kamas and Oakley, as well as the town of Peoa. The Kamas quadrangle is located at the intersection of several major tectonic elements. </SPAN></SPAN></P><P STYLE="margin:0 0 6 0;"><SPAN><SPAN>The Uinta anticline formed during the Laramide orogeny (Late Cretaceous to Eocene) as a major, doubly plunging, east-west basement</SPAN></SPAN><SPAN><SPAN>-</SPAN></SPAN><SPAN><SPAN>cored anticlinal arch and plunges west beneath Kamas Valley. Paleozoic strata broadly dip southwest to northwest, defining the western plunge throughout the map area. The Frog Valley thrust fault present in the north part of the map is interpreted as thin-skinned deformation related to the Jurassic to Cretaceous Sevier fold and thrust belt. This fault was subsequently rotated northwest and steepened by a buried strand of the North Flank fault of the Laramide Uinta Mountain Uplift. The steepened thrust fault continues west beyond the map area and connects to a larger system of thrust faults including the Crandall Canyon, Absaroka, and the North Flank faults. </SPAN></SPAN></P><P STYLE="margin:0 0 6 0;"><SPAN><SPAN>Paleogene volcanic rocks overlie older rocks and preexisting structures throughout the Kamas quadrangle. During the Paleogene, intermediate dikes and shallow intrusions fed stratovolcanoes which erupted the Keetley Volcanics. Lava flows, volcaniclastic deposits, and ash-fall deposits blanketed a large swath of the map area with significant thickness variations due to paleotopography and potential active normal faulting at the time of deposition. An eroded volcanic stock (Indian Hollow) with a radial dike swarm that sourced the extrusive volcanics is present in the southwestern part of the map area.</SPAN></SPAN></P><P STYLE="margin:0 0 1 1;"><SPAN><SPAN>The East Kamas Valley fault forms a half graben system that bounds the eastern margin of Kamas Valley. Although concealed by Quaternary alluvial, fluvial, and mass movement deposits, its presence is apparent from gravity, well, and geomorphic data. There are five main types of unconsolidated Quaternary deposits in the map area: landslide deposits, colluvium, alluvium, alluvial-fan deposits, and glacial outwash deposits.</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV> Program Manager: Stefan M. Kirby Project Manager: Zachary W. Anderson GIS and Cartography: Keilee A. Higgs Geology Review: Zachary W. Anderson GIS and Cartography Review: Austin J. Jensen and Subigya Shah Funding: Funded by the Utah Geological Survey and the U.S. Geological Survey, National Cooperative Geologic Mapping Program, through USGS STATEMAP award number G22AC00383 (2022–2024). Interim Geologic map of the Kamas 7.5' quadrangle, Summit and Wasatch Counties, Utah Reeher, L.J., 2024, Interim geologic map of the Kamas quadrangle, Summit and Wasatch Counties, Utah: Utah Geological Survey Open-File Report 763, 16 p., 2 plates, https://doi.org/10.34191/OFR-763. Interim Geologic map of the Kamas 7.5' quadrangle, Summit and Wasatch Counties, Utah 2024-06-30T00:00:00 1.0 Open-File Report 763 Lauren J. Reeher Utah Geological Survey Project Geologist 1594 W. North Temple Salt Lake City Utah 84116 lreeher@utah.gov US (724) 974-8308 Monday - Thursday 6 am - 4:30 pm raster digital data geoscientific information geologic map geology contacts faults lineaments dikes landslide scarps geologic formations geologic units GIS Kamas Summit County Wasatch County 7.5-Minute Quadrangle Utah -111.375 -111.250 40.750 40.625 1 ISO 19115 Topic Categories geoscientificInformation geoscientific information, geologic map, geology, contacts, faults, lineaments, dikes, landslide scarps, geologic formations, geologic units, GIS, Kamas, Summit County, Wasatch County, 7.5-Minute Quadrangle, Utah Kamas Summit County Wasatch County Utah Esri ArcGIS Pro <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This open-file release makes information available to the public that has undergone only minimal peer review and may not conform to Utah Geological Survey technical, editorial, or policy standards. The map may be incomplete, and inconsistencies, errors, and omissions have not been resolved. The Utah Department of Natural Resources, Utah Geological Survey, makes no warranty, expressed or implied, regarding the suitability of this product for a particular use, and does not guarantee accuracy or completeness of the data. The Utah Department of Natural Resources, Utah Geological Survey, shall not be liable under any circumstances for any direct, indirect, special, incidental, or consequential damages with respect to claims by users of this product. For use at 1:24,000 scale.</SPAN></P><P><SPAN>This geologic map was funded by the Utah Geological Survey and the U.S. Geological Survey, National Cooperative Geologic Mapping Program, through USGS STATEMAP award number G22AC00383 (2022–2024). The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government.</SPAN></P></DIV></DIV></DIV> Map data were newly prepared specifically for this quadrangle by the Utah Geological Survey Geologic Mapping Program. The geology for this map was prepared by the author from 2023 to 2024, with most of the fieldwork done in 2023. The author compiled and mapped the geology in the field and office using a combination of GPS-enabled tablets equipped with georectified aerial imagery, orthoimagery, lidar data, previously published geologic maps, topographic maps, and applications for digital attitude collection. We also used hand-held GPS units, Brunton compasses, and field notebooks to collect geologic data. Field data were transferred to a Geographic Information System (GIS) using ESRI ArcGIS software, where the map was compiled, formatted, and completed. ArcGIS and Adobe Illustrator were used to create and compile plate 2 materials. 2023-07-01T00:00:00 Lauren J. Reeher Utah Geological Survey Project Geologist 1594 W. North Temple Salt Lake City Utah 84116 lreeher@utah.gov US (724) 974-8308 Monday - Thursday 6 am - 4:30 pm Lauren J. Reeher dataset EPSG 6.11(3.0.1) 705 Simple FALSE 705 TRUE FALSE MapUnitPolys Feature Class 705 OBJECTID OBJECTID OID 4 0 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Shape Geometry 0 0 0 Feature geometry. Esri Coordinates defining the features. 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