- Usage in publication:
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- Otter Creek Microdiorite
- Modifications:
-
- Named
- Dominant lithology:
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- Diorite
- AAPG geologic province:
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- South Oklahoma folded belt
Summary:
Named after Otter Creek, Kiowa Co, OK in the South Oklahoma folded belt province. Type area designated in sec 15, T4N, R17W. Was formerly included in the Raggedy Mountain Gabbro Group by Ham and others (1964). Consists of dark green-gray aphanite containing andesine, green hornblende, biotite, apatite, ilmenite, magnetite, and sulfides. Quartz, alkali feldspar, hypersthene, and augite present in some samples. Geologic map. Stratigraphic chart. Occurs as dikes, sills, and irregular intrusions in the Glen Mountains. Intrudes the Glen Mountains Layered Complex (new) of the Raggedy Mountain Gabbro Group and the Roosevelt Gabbros (new) of the Raggedy Mountain Gabbro Group. Of Cambrian age.
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 ([ ]).