Profile Picture Utah Open Data Portal

created Jan 13 2018

updated Jan 13 2018

Description

This product is a digital geographic information system (GIS) dataset of the geologic map of the southern Pine Valley area, published by the U.S. Geological Survey in 1987 at a scale of 1:50,000 (USGS Map I-1794), and authored by M.G. Best, H.T. Morris, R.W. Kopf, and J.D. Keith. The map covers four standard 7.5’ quadrangles in southwestern Utah: Observation Knoll, The Tetons, Bible Spring, and Mountain Spring Peak. The GIS was completed in a cooperative project between geology students at Brigham Young University and the Utah Geological Survey in 2014-15. Final GIS review and preparation for public release was completed by GIS analysts with the Utah Geological Survey.The southern Pine Valley area is in the Basin and Range Province of southwestern Utah and is dominated by north-south mountain ranges and broad valleys. This map covers the southern end of Pine Valley where the topographic highs of the Wah Wah Mountains and Blawn Mountain area extend southwest into the Broken Ridge, North Peaks, and Indian Peak Range areas to encapsulate the southern end of Pine Valley. The ranges expose Middle to Upper Cambrian and Middle Ordovician to Upper Mississippian sedimentary rocks that compose the upper plate of the Blue Mountain thrust fault. The upper plate of the Blue Mountain thrust fault is cut by the Tetons and Dry Canyon thrust faults in the northwest portion of the map. In the north-central portion of the map, an erosional window in the lower plate of the Blue Mountain thrust exposes Jurassic and Triassic(?) Navajo Sandstone. All thrust faulting within the map area is a result of contractional deformation that occurred during the Cretaceous Sevier orogeny. Oligocene to Miocene volcanic, volcaniclastic and minor amounts of intrusive rocks unconformably overlie and intrude Paleozoic rocks. North- to northeast-striking normal faults cut Paleozoic and Cenozoic rocks and are the result of the Tertiary Basin and Range extension. The map area is cut from southwest to northeast by the Bible Spring fault zone, an anastomosing system of northeast-striking, Tertiary normal faults. The Bible Spring fault zone does not cut the younger Miocene rhyolite member of the Steamboat Mountain Formation (Tsr) but is likely the conduit for hydrothermally-altering fluids which created a geochemical anomaly within the unit. Quaternary alluvium covers the topographically lower portions of the map area.

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