Usage:
Idaho Group (ID*,OR*)
Subunits:
(alphabetical): Aldape Park Basalt (ID), Bandbury Basalt (ID*) or Banbury Formation (ID*), Black Mesa Gravel (ID*), Bruneau Formation (ID*), Chalk Butte Formation (ID,OR), Chalk Hills Formation (ID*,OR*), Glenns Ferry Formation (ID*), Grassy Mountain Formation (OR), Kern Basin Formation (ID*), Poison Creek Formation (ID*), Tenmile Gravel (ID), Thorn Creek Beds (ID), Tuana Gravel (ID*).
Geologic age:
Tertiary*
Miocene*
Pliocene*
Quaternary*
Pleistocene*
Type section, locality, area and/or origin of name:
Not stated. Name applied to sediments deposited in Lake Idaho (Cope, 1884).
AAPG geologic province:
Snake River basin*
Great Basin 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 ([ ]).