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Paper No. 31-12
Presentation Time: 8:00 AM-5:30 PM
GEOLOGIC MAP OF THE WEST HALF OF THE SALINA 30 X 60 QUADRANGLE, CENTRAL UTAH
After over 40 years of detailed field mapping, research, and compilation, the geologic map of the geologically complex west half of the Salina 30′ x 60′ quadrangle is in final review for release as an open-file report by the Utah Geological Survey (UGS) where it will fill a large gap in the intermediate-scale geologic map series. This map builds on student mapping in the 1960s, large UGS and U.S. Geological Survey mapping projects in the 1980s, and STATEMAP and EDMAP projects over the last dozen years. As the final “piece of the puzzle,” recently acquired lidar data allow mapping of extensive Holocene fault scarps, landslides, and glacial features in the heavily vegetated High Plateaus. Middle Jurassic to Quaternary marine, terrestrial, volcanic, and intrusive rocks are exposed across the quadrangle. Fluvial transport and alluvial fans dominate in valleys, whereas upland areas include sedimentary and volcanic rock units prone to mass wasting with small to large landslides, debris flows, and colluvial creep. Glaciers and rock glaciers carved the highest plateaus during the late Pleistocene. The north-south-trending Sanpete-Sevier Valley anticlinorium bounds Sevier Valley and has a multi-faceted history of deposition, thrusting, diapirism, deformation, and erosion that ranges from the Middle Jurassic to the present. The late Eocene Wasatch monocline extends through the quadrangle. The map covers the northeast flank of the Oligocene-Miocene Marysvale volcanic field with interleaved volcanic, intrusive, and volcaniclastic rocks and a part of the massive latest Oligocene Monroe Peak caldera. The map area is crossed by many high-angle normal faults, several with prominent Holocene or late Pleistocene scarps. Fish Lake, a popular recreation area, sits in a graben formed by recent faulting and is partially dammed by Pinedale-age glacial moraines. The area has abundant geologic resources including gypsum, salt, clay, oil, gas, construction materials, and coal.