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Coleharbor Formation- Offshore Sediment- Ice-Walled Lake Sediment or Collapsed Supraglacial-Lake Sediment

Laminated silt and clay of glacier-dammed lakes; as thick as 60 meters (200 feet). Flat-bedded sediment elevated above surrounding area or floded sediment with hummocky topography.
StateNorth Dakota
NameColeharbor Formation- Offshore Sediment- Ice-Walled Lake Sediment or Collapsed Supraglacial-Lake Sediment
Geologic agePhanerozoic | Cenozoic | Quaternary | Pleistocene Holocene
Original map labelQcoh
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 > 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 coverageBenson - Bottineau - Burke - Burleigh - Dickey - Divide - Emmons - Kidder - LaMoure - Logan - McIntosh - McKenzie - McLean - Mountrail - Ramsey - Ransom - Richland - Rolette - Sargent - Sheridan - Stutsman - Towner - Ward - Wells - Williams

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=NDQcoh;0
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