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Limestone and sandstone; Early Jurassic Cordilleran retroarc-foreland-basin deposits; southeastern Idaho

Lower Jurassic shallow-marine to non-marine sediments; shaley, sandy limestone overlaying red, crossbedded sandstone of eastern Idaho.
State Idaho
Name Limestone and sandstone; Early Jurassic Cordilleran retroarc-foreland-basin deposits; southeastern Idaho
Geologic age Early Jurassic
Comments shallow marine limestone (lower Twin Creek Fm), and shallow marine to eolian sandstone (upper Nugget Sandstone)
Primary rock type limestone
Secondary rock type sandstone
Other rock types
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)Twin Creek Limestone (lower part is Jl)
Sedimentary > Clastic > Sandstone (Bed)Nugget Sandstone (upper part is Jl)
Map references
Bond, J.G., Kauffman, J.D., Miller, D.A., and Venkatakrishnan, Ramesh, 1978, Geologic map of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, with contributions from U.S. Geological Survey, scale 1:500,000.
Unit references
Bond, J.G., Kauffman, J.D., Miller, D.A., and Venkatakrishnan, Ramesh, 1978, Geologic map of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, with contributions from U.S. Geological Survey, scale 1:500,000.
Counties Bear Lake - Bingham - Bonneville - Caribou - Custer