Clay to boulder-size clasts forming rubble residuum and talus. Thickness up to 30 ft (9m).
State South Dakota
Name Colluvium
Geologic age Quaternary
Lithologic constituents
Unconsolidated > Coarse-detrital (Colluvial)clay to boulder-sized clasts
Unconsolidated > Fine-detrital (Colluvial)clay to boulder-sized clasts

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, GM 10, scale 1:500,000.

NGMDB product
Counties Lawrence - Lyman - Meade - Mellette - Pennington - Perkins