2448, Raft River Mountains Fault

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2448, RAFT RIVER MOUNTAINS FAULT Structure number: 2448. Comments: Hecker's (1993) fault number 6-17. Structure name: Raft River Mountains fault. Comments: Synopsis: Poorly understood middle to late Pleistocene(?) fault in the Raft River Mountains. The fault is in both Utah and Idaho. Date of compilation: 10/99. Compiler and affiliation: Bill D. Black (Utah Geological Survey) and Suzanne Hecker (U.S. Geological Survey). State: Utah. County: Box Elder. 1° x 2° sheet: Brigham City. Province: Basin and Range. Reliability of location: Poor. Comments: Mapped by Compton (1972) and Doelling (1980). Mapping from Doelling (1980). Geologic setting: North-trending normal fault near the Utah-Idaho border along the northeast side of the Raft River Mountains. The Raft River Mountains have a core of Precambrian metamorphic rocks and trend east-west, similar to the Uinta Mountains. Northern slopes of the mountains drain into the Snake River and are considered part of the Snake River Plain, rather than the Great Basin. Sense of movement: N. Comments: Dip: No data. Comments: Dip direction: E. Geomorphic expression: Faulted alluvium. Age of faulted deposits: Middle to late Pleistocene(?). Paleoseismology studies: None. Timing of most recent paleoevent: (4) Middle and late Quaternary (<750 ka). Comments: Recurrence interval: No data. Comments: Slip rate: Unknown, probably <0.2 mm/yr. Comments: Length: End to end (km): 2 Cumulative trace (km): 2 Average strike (azimuth): N1°E REFERENCES Compton, R.R., 1972, Geologic map of the Yost quadrangle, Box Elder County, Utah and Cassia County, Idaho: U.S. Geological Survey Miscellaneous Investigations Series Map I-672, scale 1:31,680. Doelling, H.H., 1980, Geology and mineral resources of Box Elder County, Utah: Utah Geological and Mineral Survey Bulletin 115, 251 p., scale 1:125,000. Hecker, Suzanne, 1993, Quaternary tectonics of Utah with emphasis on earthquake- hazard characterization: Utah Geological Survey Bulletin 127, 2 plates, scale 1:500,000, 257 p. .

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Notice Concerning Copyright Restrictions
NOTICE CONCERNING COPYRIGHT RESTRICTIONS This document may contain copyrighted materials. These materials have been made available for use in research, teaching, and private study, but may not be used for any commercial purpose. Users may not otherwise copy, reproduce, retransmit, distribute, publish, commercially exploit or otherwise transfer any material. The copyright law of the United States (Title 17, United States Code) governs the making of photocopies or other reproductions of copyrighted material. Under certain conditions specified in the law, libraries and archives are authorized to furnish a photocopy or other reproduction. One of these specific conditions is that the photocopy or reproduction is not to be "used for any purpose other than private study, scholarship, or research." If a user makes a request for, or later uses, a photocopy or reproduction for purposes in excess of "fair use," that user may be liable for copyright infringement. This institution reserves the right to refuse to accept a copying order if, in its judgment, fulfillment of the order would involve violation of copyright law. Geothermal Resources Council, TRANSACTIONS Vol. 4, September 1980 SUBSURFACE GEOLOGY OF THE RAFT RIVER GEOTHERMAL AREA, IDAHO H. R. Covington U.S. Geological Survey Box 25046, Denver Federal Center Denver, CO 80225 ABSTRACT . northward onto the Snake River Plain and is flanked on the east by the Sublette and Black Pine The Raft River Valley occupies an upper Mountains, on the west by the Jim Sage and Cenozoic structural basin filled with nearly Cotterel Mountains and on the south by the Raft 1,600 m of fluvial silt, sand, and gravel.
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