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