- Usage in publication:
-
- Sillusi flow
- Modifications:
-
- Areal extent
- AAPG geologic province:
-
- Eastern Columbia basin
Summary:
Pg. 25. Sillusi flow of Priest Rapids Basalt Member of Yakima Basalt. Flow about 100 feet thick in Priest Rapids Basalt Member (new) of Yakima Basalt. Name credited to Laval (1956, unpub. thesis). Age is Miocene.
Source: US geologic names lexicon (USGS Bull. 1350, p. 693-694).
- Usage in publication:
-
- Sillusi flow
- Modifications:
-
- Areal extent
- AAPG geologic province:
-
- Eastern Columbia basin
Summary:
Pg. 95. Sillusi flow of Priest Rapids Member of Yakima Basalt. In eastern part of Toppenish Ridge and Horse Heaven Hills, [west and south of Mabton, Zillah quadrangle (scale 1:125,000), Yakima County, south-central Washington], the Priest Rapids Member includes: Basal flows, Mabton interbed, and the Upper (Umatilla and Sillusi) flows. Both flows are well exposed upstream from McNary Dam in the walls of Wallula Gap. [Age is Miocene.]
Crops out [along Columbia River] on south face of Sillusi Butte near McNary Dam, [in sec. 4, T. 5 N., R. 28 E., Umatilla 7.5-min quadrangle, Benton Co., southern WA].
Source: US geologic names lexicon (USGS Bull. 1350, p. 693-694).
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 ([ ]).