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Outwash, Undifferentiated

Heterogeneous sand and gravel with minor clay of glaciofluvial orgin. Thickness up to 90 ft (27 m).
State South Dakota
Name Outwash, Undifferentiated
Geologic age Phanerozoic | Cenozoic | Quaternary | Pleistocene [Illinoian(?) Pre-Illinoian]
Primary rock type sand
Secondary rock type gravel
Other rock types clay or mud
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Sand (Glacial, outwash)
Unconsolidated > Coarse-detrital > Gravel (Glacial, outwash)
Minor
Unconsolidated > Fine-detrital > Clay (Glacial, outwash)
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
Counties Minnehaha