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Alluvium

Alluvium: mainly valley fill consisting of silt, sand, and gravel; includes some terrace deposits and glacial drift of Pleistocene age in some areas; locally includes hot spring tufa. The older part of the alluvium, where present, is probably of Pliocene age.
StateMontana
NameAlluvium
Geologic agePhanerozoic | Cenozoic | Quaternary
Original map labelQal
Primary rock typealluvium
Secondary rock typeglacial drift
Other rock typescarbonate
Lithologic constituents
Major
Unconsolidated > Coarse-detrital (Alluvial)
Unconsolidated > Fine-detrital (Alluvial)
Minor
Unconsolidated > Fine-detrital (Glacial)
Unconsolidated > Coarse-detrital (Glacial)
Incidental
Sedimentary > Carbonate (Lense)Hot spring tufa deposits
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
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.
Geographic coverageBeaverhead - Big Horn - Blaine - Broadwater - Carbon - Carter - Cascade - Chouteau - Custer - Daniels - Dawson - Deer Lodge - Fallon - Fergus - Flathead - Gallatin - Garfield - Glacier - Golden Valley - Granite - Hill - Jefferson - Judith Basin - Lake - Lewis and Clark - Lincoln - McCone - Madison - Meagher - Mineral - Missoula - Musselshell - Park - Petroleum - Phillips - Pondera - Powder River - Powell - Prairie - Ravalli - Richland - Roosevelt - Rosebud - Sanders - Sheridan - Silver Bow - Stillwater - Sweet Grass - Teton - Treasure - Valley - Wheatland - Wibaux - Yellowstone

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