- Usage in publication:
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- Valmy Formation*
- Modifications:
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- Geochronologic dating
- AAPG geologic province:
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- Great Basin province
Summary:
Pg. 22, geologic time scale (inside front cover). Valmy Formation. Quartzite sample from Utah Mine, Shoshone Range, Mount Lewis quadrangle, Lander County, Nevada, yielded a Pb-alpha age of 2,030 +/-300 Ma (zircon), indicating average age of source rock [Precambrian X]. Age published by Ketner (1977); recalculated using decay constants of Steiger and Jager, 1977 (Earth Planet. Sci. Letters, v. 36, p. 359-362).
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 ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).