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National Geologic Map Database
Geologic Unit: Sanish
Map showing publication footprint
  • Usage in publication:
    • Sanish sand*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Williston basin
Publication:

Sandberg, C.A., and Hammond, C.R., 1958, Devonian System in Williston basin and central Montana: American Association of Petroleum Geologists Bulletin, v. 42, no. 10, p. 2293-2334. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

An informally named unit of fine-grained sandstone and coarse-grained siltstone, 5 to 15 ft thick, present locally at the top of the Three Forks formation at south end of Nesson anticline, western ND in the subsurface of Williston basin. [Formerly included as basal unit of overlying Bakken formation.] Of Late Devonian 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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