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National Geologic Map Database

Geologic Unit: Hyalite Peak

Usage:

Hyalite Peak Volcanics of Washburn Group of Absaroka Volcanic Supergroup (MT*)


Geologic age:

early Tertiary (Eocene)*


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

Representative section measured 3.8 mi north of Hyalite Peak, on east wall of West Fork Middle Creek Canyon, in sec. 2, T. 5 S., R. 6 E., Fridley Peak 15-min quadrangle, Park Co., southwestern MT (Chadwick, 1969).


AAPG geologic province:

Montana folded belt*


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