Till, Stagnation Moraine (SDQlts;0)

Heterogeneous, clay with silt to boulder-size clasts of glacial orgin. A geomorphic feature that is characterized by hummocky terrain with abundant sloughs resulting from stagnation of ice sheets. Composite thickness of all Upper Wisconsin till may be up to 300 ft (91 m).

State	South Dakota
Name	Till, Stagnation Moraine
Geologic age	Phanerozoic \| Cenozoic \| Quaternary \| Pleistocene [Upper Wisconsin]
Original map label	Qlts
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	Aurora - Beadle - Bon Homme - Brookings - Brown - Brule - Buffalo - Campbell - Charles Mix - Clark - Clay - Codington - Davison - Day - Deuel - Douglas - Edmunds - Faulk - Grant - Hamlin - Hand - Hanson - Hughes - Hutchinson - Hyde - Jerauld - Kingsbury - Lake - Lincoln - McCook - McPherson - Marshall - Miner - Minnehaha - Moody - Potter - Roberts - Sanborn - Spink - Sully - Turner - Walworth - Yankton