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Older Metasedimentary Rocks

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Gray phyillite, mica schist, and biotite-plagioclase schist. Total thickness unknown; approximately 500 ft (152 m) exposed.
State South Dakota
Name Older Metasedimentary Rocks
Geologic age Late Archean
Lithologic constituents
Major
Metamorphic > Schist > Mica-schist
Metamorphic > Schist > Mica-schist > Biotite-schistbiotite-plagioclase schist
Metamorphic > Metasedimentary > Metaclastic > Phyllite
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 Lawrence - Meade - Pennington