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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. |
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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. |
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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). |
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<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> |
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<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> |
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Interim Geologic map of the Kamas 7.5' quadrangle, Summit and Wasatch Counties, Utah |
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["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"] |
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