Usage:
basalt of Sand Hollow (informal) in Frenchman Springs Member of Wanapum Basalt of Columbia River Basalt Group (OR*,WA*)
basalt of Sand Hollow (informal) in Frenchman Springs Member of Wanapum Basalt of /Yakima basalt subgroup [informal] of Columbia River Basalt Group (OR*,WA*)
Also called flows of Sand Hollow (informal).
Informal. The rank or lithologic term should not be capitalized. [Yakima basalt subgroup considered informal and should not be capitalized. "Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). Columbia River Basalt Group adopted by the ID, OR, and WA Geol. Surveys, and the USGS (rules suspended).]
Geologic age:
late Tertiary (middle Miocene)*
Type section, locality, area and/or origin of name:
Named from occurrence in Sand Hollow [on east bank of Columbia River, in secs. 26, 27, and 28, T. 17 N., R. 23 E., Vantage 7.5-min quadrangle, Grant Co.], between Vantage and Priest Rapids, central southern WA (Mackin, 1961).
AAPG geologic province:
Eastern Columbia basin*
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 ([ ]).