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National Geologic Map Database

Geologic Unit: Idaho

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 ([ ]).