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

Geologic Unit: North Boulder

Usage:

No current usage.
(†North Boulder Group (MT) replaced with LaHood Formation. See LaHood.)


Geologic age:

Proterozoic


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

Not synopsized to date.


AAPG geologic province:

Northern Rocky Mountain region


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 ([ ]).