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Program Manager: Grant C. Willis (UGS) Project Manager (GIS): Donald L. Clark
GIS and Cartography: Basia Matyjasik, Jay C. Hill, Kent D. Brown (UGS), Sue Priest (USGS)
Geology review: Jon K. King, Grant C. Willis, Michael D. Hylland, Robert M. Ressetar (UGS), Paul Stone (USGS)
GIS review: Kent D. Brown (UGS) |
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This digital dataset represents the geology of the Grouse Creek and east part of the Jackpot 30' x 60' quadrangles at 1:62,500 scale. The map area lies in the northwest corner of Utah and covers the hinterland of the Sevier fold-thrust belt, part of the Albion-Raft River-Grouse Creek metamorphic core complex, and eastern Basin and Range Province, thus leading to very complicated structural relationships. The area includes the oldest exposed rocks in Utah, the Green Creek Complex (~2.6 Ga, Archean). Overlying Neoproterozoic metamorphic rocks include schist and quartzite units, and parts of the Neoproterozoic and Paleozoic sections have been metamorphosed and severely attenuated. Several marine Permo-Triassic units were also structurally deformed through compression and extension. Eocene-Oligocene volcanism occurred during the onset of another phase of extension. A thick sequence of Tertiary strata (Salt Lake Formation) and coeval volcanic rocks fill several basins developed during the Miocene extensional regime; new age data help constrain the timing. Deposits of Lake Bonneville and other Quaternary depositional environments blanket large parts of the quadrangles. Geologic map preparation and interpretations were substantially aided by the acquisition of geophysical (gravity and aeromagnetic) data. This project is a cooperative effort between the U.S. Geological Survey and the Utah Geological Survey. |
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OFR716DM_GrouseCreek30x60_GeologicSymbols |
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