U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Bluebird

Usage:

No current usage.
(†Bluebird Aplite (MT-recognized locally in Butte area) considered obsolete.)


Geologic age:

late Tertiary (Miocene)


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

Notable exposures in Butte district, [Silver Bow Co.], MT (Weed, 1899).


AAPG geologic province:

Montana folded belt


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).