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Metaconglomerate

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Tan to light-gray, conglomeratic siliceous schist, feldspathic schist, and minor marble. Thickness locally over 6,000 ft (1,829 m).
State South Dakota
Name Metaconglomerate
Geologic age Early Proterozoic
Lithologic constituents
Major
Metamorphic > Schistconglomeratic siliceous schist, feldspathic schist
Minor
Metamorphic > Metasedimentary > Metacarbonate > Marble
References

Martin, J.E., Sawyer, J.F., Fahrenbach, M.D., Tomhave, D.W., and Schulz, L.D., 2004, Geologic Map of South Dakota: South Dakota Geological Survey, GM 10, scale 1:500,000.
NGMDB product
Counties Custer - Lawrence - Pennington