Metamorphosed Black Shale (SDXbs;0)

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	Proterozoic \| Paleoproterozoic
Original map label	Xbs
Primary rock type	schist
Secondary rock type	chert
Other rock types
Lithologic constituents	Major Metamorphic > Schist Minor Sedimentary > Chemical > Chert (Bed)
Map 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
Unit 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
Geographic coverage	Custer - Lawrence - Pennington