Pollock Formation (SDQp;0)

Glaciolacustrine clay and silty clay with laminae of very fine-grained sand near the middle and base of the formation. Thickness up to 165 ft (50 m).

State	South Dakota
Name	Pollock Formation
Geologic age	Phanerozoic \| Cenozoic \| Quaternary \| Pleistocene [Upper Wisconsin]
Original map label	Qp
Primary rock type	clay or mud
Secondary rock type	sand
Other rock types
Lithologic constituents	Major Unconsolidated > Fine-detrital > Clay (Lacustrine) Minor Unconsolidated > Coarse-detrital > Sand (Lacustrine)
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	Campbell - Walworth