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Scientific Investigations Map 3191

Geologic Map of the Fish Creek Reservoir 7.5’ Quadrangle, Blaine County, Idaho

By Betty Skipp and Theodore R. Brandt

Thumbnail of and link to publication contentsAbstract

The Fish Creek Reservoir quadrangle in south-central Idaho lies on the north-central margin of the Cenozoic Snake River Plain at the southern end of the Pioneer Mountains. Rocks exposed in the quadrangle range in age from Paleozoic through Cenozoic. Mesozoic rocks are absent. Though Triassic and Jurassic sedimentary rocks may have been deposited in this area, they have been removed by erosion following uplift and thrusting of the Late Cretaceous to early Tertiary Sevier orogeny. The Late Devonian to Early Mississippian Antler orogeny preceded the Sevier. Ordovician through Devonian rocks of western-derived shale and sandstone facies and eastern carbonate shelf facies are unconformably overlain respectively by Pennsylvanian-Permian Wood River and Mississippian Copper Basin Formations. These two sequences are exposed in structural windows juxtaposed by the Sevier-age Pioneer thrust fault. Interpretive cross-sections accompany the map. Volcanic rocks of the Eocene Challis Volcanic Group, Miocene Idavada Volcanics, and Pleistocene Snake River Group cover parts of the area that remains tectonically active.

First posted May 24, 2012

  • Data Files
    Contains related data, GIS, and Shape files. Refer to the README and metadata files for more information about this dataset.

For additional information contact:
USGS Central Mineral and Environmental Resources Science Center
Box 25046, Mail Stop 973
Denver, CO 80225
minerals.cr.usgs.gov

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Suggested citation:

Skipp, Betty, and Brandt, T.R., 2012, Geologic map of the Fish Creek Reservoir 7.5’ quadrangle, Blaine County, Idaho: U.S. Geological Survey Scientific Investigations Map 3191, 1 sheet, scale 1:24,000, pamphlet, 15 p.



Pamphlet Contents

Introduction

Regional Geology

Acknowledgments

Description of Map Units

References Cited


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