Usage:
Gallatin Group (ID*,MT*,WY*)
Gallatin Limestone (ID*,WY*)
Gallatin Formation (ID*,WY*)
Subunits:
GROUP STATUS (alphabetical): Pilgrim Limestone (MT*,WY*) or Pilgrim Dolostone (ID*,MT*), Snowy Range Formation (MT*,WY*).
FORMATION STATUS (alphabetical) --all in WY*: Du Noir Member, Open Door Member.
Geologic age:
Late Cambrian*
Type section, locality, area and/or origin of name:
Named from typical occurrence in Gallatin Range, the southern extension of which is in northwestern corner of Yellowstone Park (Weed, 1896).
AAPG geologic province:
Bighorn basin*
Green River basin*
Montana folded belt*
Powder River basin*
Wind River basin*
Yellowstone province*
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 ([ ]).