- Usage in publication:
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- Prater Creek Ash-flow Tuff
- Modifications:
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- Named
- Dominant lithology:
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- Tuff
- AAPG geologic province:
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- Great Basin province
Summary:
Named for exposures along Prater Creek, 17 km northeast of Burns, OR. Type section designated on walls of Poison Creek, adjacent to HWY 395, 11 to 12 km north of Burns, 43 deg 41'N, 119 deg W, Harney Co, OR. Tuff originally named Prater Creek Member of Danforth Formation of Parker and Armstrong (1972). Name Danforth Formation has been abandoned. Consists of pale-grayish-red tuff which is devitrified and crystal-poor with abundant grayish-pink 2-cm or smaller lithophysae. Is 12 m thick with range up to 30 m. Overlies unnamed tuffaceous sedimentary rocks which overlie Devine Canyon Ash-flow Tuff; underlies unnamed tuffaceous sedimentary rocks and basalt which underlie Rattlesnake Ash-flow Tuff. Age is late Miocene on basis of K-Ar determinations of 8.6 to 8.2 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 ([ ]).