- Usage in publication:
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- Long Mountain Formation
- Modifications:
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- Revised
- AAPG geologic province:
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- South Oklahoma folded belt
Summary:
Study area is within Wichita Mountains, southwestern Oklahoma (S. Oklahoma folded belt province). /Wichita Granite Group provisionally revised, from consisting of 5 units (Mount Scott, Headquarters, Reformatory, Lugert, and Quanah) to 10 units (with the addition of Cache, Cooperton, Long Mountain, Medicine Park, and Saddle Mountain). Wichita igneous province divided into eastern and western provinces. Eastern province contains largest area of outcrop, but most of existing nomenclature originated in western part. In the eastern province, the Wichita Granite Group (revised) consists of: Mount Scott Granite, Saddle Mountain Formation, Medicine Park Formation, Cache Formation, and Quanah Granite. In the western province, the Wichita consists of: Mount Scott Granite, Headquarters Granite, Reformatory Granite, Long Mountain Formation, Cooperton Formation, and Lugert Granite. Wichita Granite Group is intrusive equivalent of /Carlton Rhyolite Group. Age of Wichita is Middle Cambrian (525 +/-25 m.y.). Report includes geochemistry, stratigraphic table, map showing distribution of units.
Name Long Mountain Formatiom informally used by Hessa (1964, unpub. thesis). Unit is highly granophyric and distinct from other granites. Mappable from near intersection of US Highway 62 and OK Highway 54 west to Navajoe Mountain area. Is similar to the Cooperton granites, except hornblende is typical in Long Mountain and biotite is typical in Cooperton. Long Mountain is cut by what is assumed to be Lugert Granite.
Is the granite occurring in and around Long Mountain, 4 miles west of Snyder (in sec. 8, T. 2 N., R. 17 W. and sec. 13, T. 2 N., R. 18 W.), Kiowa Co., OK, S. Oklahoma folded belt province. Derivation of name not stated, but probably named from Long Mountain.
[Wichita Granite Group preempted by Wichita [Group] of Cummins (1890) in TX; conflicts with nomenclature guidelines stating a group name combines a geographic name with the term "group," and no lithic designation is included (ACSN, 1961, 1970; NACSN, 1983, 2005, 2021).]
Source: Modified from 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 ([ ]).