Till, Ground Moraine (SDQit;0)

Heterogeneous, clay with silt to boulder-size clasts. Exhibits a distinctive weathered, dissected surface. Contains prominent oxidized joints and fractures with gypsum or calcite. Typically overlain by up to 25 ft (8 m) of loess. Thickness up to 120 ft (37 m).

State	South Dakota
Name	Till, Ground Moraine
Geologic age	Phanerozoic \| Cenozoic \| Quaternary \| Pleistocene [Illinoian(?)]
Original map label	Qit
Primary rock type	clay or mud
Secondary rock type	silt
Other rock types	sand; gravel
Lithologic constituents	Major Unconsolidated > Coarse-detrital > Boulders (Glacial, till) Unconsolidated > Coarse-detrital > Gravel (Glacial, till) Unconsolidated > Coarse-detrital > Sand (Glacial, till) Unconsolidated > Fine-detrital > Silt (Glacial, till) Unconsolidated > Fine-detrital > Clay (Glacial, till)
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	Brookings - Codington - Deuel - Hamlin - Minnehaha - Moody