- Usage in publication:
-
- Conical Peak Quartzite*
- Modifications:
-
- Named
- Dominant lithology:
-
- Quartzite
- Basalt
- AAPG geologic province:
-
- Northern Rocky Mountain region
Summary:
Named as the youngest formation (of five) of the Phantom Lake Metamorphic Suite in the Medicine Bow Mountains for Conical Peak, sec 4, T18N, R79W, Carbon Co, WY in the Northern Rocky Mountain region. Type locality designated in Ts18 and 19N, R79W. Is a key unit in the suite. Is predominantly white, foliated, fine-grained micaceous subarkose. Also contains calcareous quartzite and metabasalts near North Fork Rock Creek. Is conformable on Colberg Metavolcanics (named) of Phantom Lake. Is overlain unconformably by Magnolia Formation of Deep Lake Group. May have been derived from the Bow Quartzite (named) and Colberg Metavolcanics. Is about 800 m thick. Considered to be of marine origin based on fine grain size, large-scale planar crossbeds, and bimodal paleocurrents. Cross-bedding is mainly large scale and planar. Deposited in a shallow marine environment. Of Late Archean age. Geologic map; stratigraphic charts; petrographic data.
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 ([ ]).