Metamorphosed Black Shale

Dark-gray biotite schist, biotite-muscovite schist, pyritic biotite schist, and local massive chert beds. Thickness approximately 2000-4000 ft (610-1,219 m).
State South Dakota
Name Metamorphosed Black Shale
Geologic age Early Proterozoic
Lithologic constituents
Metamorphic > Schist > Mica-schist > Biotite-schistbiotite-muscovite schist, pyritic biotite schist
Sedimentary > Chemical > Chert (Bed)

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