Usage:
Chalk Hills Formation of Idaho Group (ID*)
Geologic age:
Tertiary*
Miocene, late*
Hemphillian*
Type section, locality, area and/or origin of name:
Chalk Hills, an area of badlands at head of Little Valley, 14 mi southwest of town of Bruneau, Owyhee Co., southwestern ID. Named from Chalk Hills (Malde and Powers, 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 ([ ]).