Usage:
No current usage?
(†Blacktail Formation (ID*) considered abandoned? Uncertain if used by the ID Geol. Survey or the USGS. Possibly synonymous with part of Ravalli Group of Belt Supergroup. See Ravalli.)
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Type locality: Blacktail Mountain, near Talache, Bonner Co., Pend Oreille district, northern ID (Sampson, 1928).
AAPG geologic province:
Northern Rocky Mountain region*
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 ([ ]).