Usage:
Yellowstone Group (ID*,MT*,WY*)
Subunits:
(alphabetical): Huckleberry Ridge Tuff (ID*,MT*,WY*), Lava Creek Tuff (ID*,MT*,WY*), Mesa Falls Tuff (ID*,MT*).
Geologic age:
Tertiary*
Pliocene*
Quaternary*
Pleistocene*
Type section, locality, area and/or origin of name:
Not designated. Origin of name not stated by author, but probably named from Yellowstone National Park (Boyd, 1961).
AAPG geologic province:
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 ([ ]).