Madison Group (SDMDpe;0)

Includes: Pahasapa Limestone (Mississippian)-White, light-gray to tan, fine- to medium-crystalline limestone and dolomite containing brown to gray chert. Solution features including collapse breccia, sinkholes, and caves are prevalent. Thickness 300-630 ft (91-192 m). Englewood Formation (Mississippian to Dovonian)- Pink, lavender to light-gray, thin- to medium-bedded, finely crystalline, argillaceous, dolomitic limestone. Thickness 30-63 ft (9-19 m).

State	South Dakota
Name	Madison Group
Geologic age	Phanerozoic \| Paleozoic \| Devonian Carboniferous Mississippian
Original map label	MDpe
Primary rock type	limestone
Secondary rock type	dolostone (dolomite)
Other rock types	chert
Lithologic constituents	Major Sedimentary > Carbonate > Limestone (Bed) Sedimentary > Carbonate > Dolostone (Bed) 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 - Meade - Pennington