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National Geologic Map Database

Geologic Unit: Yakima

Usage:

/Yakima basalt subgroup [informal] of Columbia River Basalt Group (ID*,OR*,WA*)

[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).]


Subunits:

"SUBGROUP" STATUS (alphabetical) --all in ID*,OR*,WA*: Grande Ronde Basalt, Saddle Mountains Basalt, Wanapum Basalt. ["Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961; NACSN, 1983, 2005).]


Geologic age:

late Tertiary (Miocene)*


Type section, locality, area and/or origin of name:

Named from occurrence in Yakima area, eastern WA (Smith, 1901).


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 ([ ]).