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Glacial lake deposits

Glacial lake deposits: mainly silt; believed to have been deposited in lakes formed behind temporary dams of ice or morainal deposits
StateMontana
NameGlacial lake deposits
Geologic agePhanerozoic | Cenozoic | Quaternary
Original map labelQgl
Primary rock typeglaciolacustrine
Secondary rock type
Other rock types
Lithologic constituents
Major
Unconsolidated > Fine-detrital (Lacustrine)Mainly silt
Map references
Ross, P.R., Andrews, D.A., and Witkind, I.J., 1955, Geologic map of Montana: U.S. Geological Survey, 2 sheets, scale 1:500,000.
Unit references
Collier, A.J. and Thom, W.T., Jr., 1918, The Flaxville Gravel and its relations to other terrace gravels of the Northern Great Plains, in Shorter contributions to general geology, 1917: U.S. Geological Survey Professional Paper 108-J, p. 179-
Geographic coverageFlathead - Lake - Lewis and Clark - Lincoln - Missoula - Powell - Ravalli - Sanders

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