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Mineral Resources > Online Spatial Data > Geology > by state > South Dakota

Colluvium

Clay to boulder-size clasts forming rubble residuum and talus. Thickness up to 30 ft (9m).
StateSouth Dakota
NameColluvium
Geologic agePhanerozoic | Cenozoic | Quaternary
Original map labelQc
Primary rock typeclay or mud
Secondary rock typesilt
Other rock typessand; gravel
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Boulders (Colluvial)
Unconsolidated > Coarse-detrital > Gravel (Colluvial)
Unconsolidated > Coarse-detrital > Sand (Colluvial)
Unconsolidated > Fine-detrital > Silt (Colluvial)
Unconsolidated > Fine-detrital > Clay (Colluvial)
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 coverageLawrence - Lyman - Meade - Mellette - Pennington - Perkins - Walworth

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