State | South Dakota |
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Name | Dakota Formation |
Geologic age | Upper to Lower Cretaceous |
Lithologic constituents |
Major
Sedimentary > Clastic > Sandstone (Bed)Light- to reddish-brown, medium- to coarse-grained quartz and minor feldspar sandstone grading upward to a fine- to medium-grained, quartz and minor feldspar sandstone.
Minor
Sedimentary > Clastic > Mudstone > Shale (Bed)Interbeds of gray to dark-gray shale in the upper portion.
Unconsolidated > Fine-detritalContains a middle, gray silty clay unit.
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References | Tomhave, D.W., and Schulz, L.D., 2004, Bedrock Geologic Map Showing Configuration of the Bedrock Surface in South Dakota East of the Missouri River, South Dakota Geological Survey, GM 9, scale 1:500,000. |
NGMDB product | |
Counties | Clay - Hutchinson - Lincoln - Turner - Union |