- Usage in publication:
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- Mitchell Gulch Formation
- Modifications:
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- Overview
- AAPG geologic province:
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- Southern Rocky Mountain region
Summary:
Defined as being less metamorphosed, and therefore younger, than Idaho Springs Formation and older than Pikes Peak Granite. However, granite that cuts the unit is not Pikes Peak but of Boulder Creek type and age. Listed as a unit of Arkansas River area of pre-1,700 m.y. (or Precambrian X age) metamorphic complex, in Southern Rocky Mountain region.
Source: GNU records (USGS DDS-6; Denver GNULEX).
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 ([ ]).