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National Geologic Map Database

Geologic Unit: Chalk Butte

Usage:

Chalk Butte Formation of Idaho Group (OR)


Geologic age:

Tertiary
Pliocene, middle


Type section, locality, area and/or origin of name:

In SE/4 sec. 20, T. 20 S., R. 45 E., Mitchell Butte 30- x 60-min quadrangle, Malheur Co., OR (Corcoran and others, 1962).


AAPG geologic province:

Snake River basin


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 ([ ]).