Usage:
Dalles Formation (OR*,WA*)
Dalles Group (OR)
Subunits:
GROUP STATUS (alphabetical) --all in OR: Alkali Canyon Formation, Chenoweth Formation, Deschutes Formation, McKay Formation, Tygh Valley Formation.
Geologic age:
late Tertiary (late Miocene)*
Type section, locality, area and/or origin of name:
[Notable exposures along Columbia River, near The Dalles, Wasco Co., western OR.]
AAPG geologic province:
Columbia basin*
Cascades province*
Blue Mountains province*
Great Basin province*
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 ([ ]).