- Usage in publication:
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- Christmas Mountains gabbro [informal]
- Modifications:
-
- Geochronologic dating
- AAPG geologic province:
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- Permian basin
Summary:
Pg. 27. Christmas Mountains gabbro [informal]. Gabbro sample from Christmas Mountains quadrangle, Brewster County, southwestern Texas, yielded a K-Ar age of 42.4 +/-0.7 Ma (biotite). Data from Mikom Jungyusuk, 1977 (Univ. Texas-Austin MS thesis, 177 p.), and P.S. Lewis, 1978 (Univ. Texas-Austin MS thesis, 120 p.); age recalculated using decay constants of Steiger and Jager, 1977 (Earth Planet. Sci. Letters, v. 36, p. 359-362).
[Age considered Eocene (from Geologic Names Committee, USGS, 1983 ed. geol. time scale, with additions from N.J. Snelling, 1985, The Geol. Soc. Mem., no. 10).]
Source: Publication.
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 ( ).
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