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Coleharbor Formation- Offshore Sediment- Eroded Lake Sediment

Laminated silt and clay of glacier-dammed lakes; as thick as 60 meters (200 feet). Flat-bedded sediment along valley sides exposed as a result of postdepositional erosion.
StateNorth Dakota
NameColeharbor Formation- Offshore Sediment- Eroded Lake Sediment
Geologic agePhanerozoic | Cenozoic | Quaternary | Pleistocene Holocene
Original map labelQcoe
CommentsColeharbor Formation- Sandy, silty clay with pebbles of limestone, dolomite, granite, gneiss, and basalt; nonorganic, bedded clay, silt, sand, and gravel; as thick as 200 meters (600 feet).
Primary rock typesilt
Secondary rock typeclay or mud
Other rock types
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clay (Glacial)
Unconsolidated > Fine-detrital > Silt (Glacial)
Map references
Clayton, Lee, 1980, Geologic Map of North Dakota: U. S. Geological Survey, Scale 1:500K.
Unit references
Clayton, Lee, 1980, Geologic Map of North Dakota: U. S. Geological Survey, Scale 1:500K.
Geographic coverageMcKenzie - Mountrail

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