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  • Usage in publication:
    • Guernsey Formation
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Williston basin
Publication:

Megathan, E.R., 1987, Silurian Interlake Group; a sequence of cyclic marine and freshwater carbonate deposits in the central Williston basin, IN Fischer, D.W., ed., Fifth international Williston basin symposium; core workshop volume: North Dakota Geological Survey Miscellaneous Series, 5th International Williston Basin Symposium, Grand Forks, ND, June 14-17, 1987, no. 69, p. 59-88., Prepared in cooperation with North Dakota and Saskatchewan geol. societies


Summary:

Is one of eight formations assigned to the Interlake Group. Name extended in subsurface to the Williston basin of central ND where it consists of nondescript interbedded dolomite, argillaceous dolomite, and anhydrite. Difficult to distinguish from the underlying Fife Lake Formation of the Interlake. Underlies Cedar Lake Formation of Interlake transitionally. [Thickness in ND not stated.] History of nomenclature chart. Silurian age.

Source: GNU records (USGS DDS-6; Denver GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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