- Usage in publication:
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- Campus Andesite
- Modifications:
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- Geochronologic dating
- AAPG geologic province:
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- Orogrande basin
Summary:
Pg. 6. Campus Andesite. Syenite sample from Smeltertown quadrangle, El Paso County, southwestern Texas, yielded a K-Ar age of 48.4 +/-2.3 Ma (biotite). Data from J.M. Hoffer, 1970 (GSA Bull., v. 81, p. 2129-2135), and F.E. Kottlowski (unpub. data); 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.
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