- Usage in publication:
-
- Magpie Hill Basalt*
- Modifications:
-
- Named
- Geochronologic dating
- Dominant lithology:
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- Basalt
- AAPG geologic province:
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- Great Basin province
Summary:
Named from small exposure at type section on Magpie Hill, sec.34 T18N R54E, Pinto Summit 15' quad, on east side of Rescue Canyon, White Pine Co, NV. Alkali olivine basalt is fine grained with microphenocrysts of olivine and plagioclase. Unconformably overlies Bates Mountain Tuff; unconformably underlies Quaternary deposits. Age is Miocene based on K-Ar determination of 19.6 Ma from sample collected in sec.2 T17N R54E (M.L. Silberman, written commun., 1971). A similar basalt just south of quad boundary gave age of 20.2 Ma.
Source: GNU records (USGS DDS-6; Menlo 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 ([ ]).