- Usage in publication:
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- Geode Creek basalt
- Modifications:
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- Original reference
- Dominant lithology:
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- Basalt
- AAPG geologic province:
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- Yellowstone province
Summary:
Pg. 19-21, 78 (table 9), pl. 4. Geode Creek basalt. Olivine basalt, with labradorite and augite. Characteristically massive, but locally may be highly vesicular. Weathers into stubby plates, up to 1 foot in length. Contains no secondary silica. Gray color and fine texture in contrast to color and texture of Crescent Hill basalt (new). Northern exposure about 60 feet high. Lies unconformably on unnamed breccia. Age is Miocene and (or) Pliocene.
Exposed in two small patches, one east of Geode Creek and other about 1 mi northwest of Crescent Hill, Yellowstone National Park, northwestern WY. The southern patch, the higher of the two, reaches elevation between 7,300 and 7,400 ft.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1495).
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 ([ ]).