- Usage in publication:
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- Shevlin Park Tuff*
- Modifications:
-
- Named
- Dominant lithology:
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- Tuff
- AAPG geologic province:
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- Cascades province
Summary:
Shevlin Park Tuff occurs in scattered outcrops and excavations between Awbrey and Overturf Buttes eastward to Deschutes River, central OR. Consists of black, andesitic, moderately welded tuff, rather well sorted along ash-flow margins. Can be viewed on east side of creek in Shevlin Park where unit forms blocks of densely welded tuff with abundant black collapsed pumice fragments. Overlies Lava Island Tuff (new). [Shevlin Park Tuff name was first used by Taylor (1980) in GSA Abstract where brief lithologic description and age can be found.] Is Pleistocene age.
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 ([ ]).