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Metamorphosed Tuffaceous Shale

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Light-gray to light-tan, muscovite schist and muscovite phylite. Thickness approximately 1,000-3,000 ft (305-914 m).
State South Dakota
Name Metamorphosed Tuffaceous Shale
Geologic age Early Proterozoic
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Phyllitemuscovite-phyllite
Metamorphic > Schist > Mica-schist > Muscovite-schist
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