Usage:
Pembina Member of Pierre Shale (ND*,Canada*)
Subunits:
Ardmore Bentonite Beds (ND*).
Geologic age:
Late Cretaceous (Campanian)*
Type section, locality, area and/or origin of name: (See Canadian Lexicon)
Named from exposures on Pembina Mountain and along Pembina River Valley in southern Manitoba, Canada. Pembina Mountain lies partly in North Dakota and partly in Manitoba, and Pembina River cuts through the mountain in both areas (Kirk, 1929).
Type section: in southeastern portion of Lsd. 4, sec. 27, Twp. 1, Range 8WPM (McNeil and Caldwell, 1981) [From Geological Survey of Canada lexicons].
Reference sections (Gill and Cobban, 1965).
AAPG geologic province:
Williston basin*
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 ([ ]).