- Usage in publication:
-
- Petaca schist
- Modifications:
-
- Named
- Dominant lithology:
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- Schist
- Quartzite
- AAPG geologic province:
-
- Southern Rocky Mountain region
Summary:
Named but neither source of name nor type locality designated. Is the quartz muscovite schist phase of the Ortega quartzite (new). Is unranked part of Ortega. Is restricted to Mesa la Jarita, Petaca area, Ts26 and 27N, R8E, Rio Arriba Co, NM, Southern Rocky Mountain region. Geologic map. Locally contains quartzite. Locally is feldspathic. Developed probably as a result of intrusion of Tusas granite (new). Of Proterozoic age.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Petaca schist
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Southern Rocky Mountain region
Summary:
Used in this report for altered parts of the Ortega quartzite, lower part of the Kiawa Mountain formation (new name), and many layers of the Burned Mountain metarhyolite. Assigned to the Precambrian.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Petaca Schistâ€
- Modifications:
-
- Abandoned
Summary:
Named applied to muscovitic metarhyolite and quartzite of Precambrian age known on Jarosa Mesa, Rio Arriba Co, in the Southern Rocky Mountain region. Has no stratigraphic significance and is therefore abandoned. Most areas mapped as Petaca are felsic metavolcanic rocks belonging to the Burned Mountain Metarhyolite (adopted). [Was never adopted by the U.S. Geological Survey.]
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 ([ ]).