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National Geologic Map Database

Geologic Unit: Virgelle

Usage:

Virgelle Sandstone of Montana Group (MT*)
Virgelle Sandstone Member of Eagle Sandstone of Montana Group (MT*)
Virgelle Sandstone Member of Eagle Sandstone (WY*)


Geologic age:

Late Cretaceous (Campanian)*


Type section, locality, area and/or origin of name:

Not stated. Is well exposed along Missouri River from town of Virgelle, a few mi below Fort Benton, Chouteau Co., MT, eastward (Stebinger, 1914).
Not designated. Named from town of Virgelle, Chouteau Co., MT (Bowen, 1915). [From GNU records (USGS DDS-6; Denver GNULEX).]


AAPG geologic province:

Montana folded belt*
Sweetgrass arch*
Central Montana uplift*


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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).