Usage:
Astoria Formation (OR*,WA*)
Astoria Shale (OR,WA)
Subunits:
Angora Peak Member (OR,WA).
Geologic age:
late Tertiary (early to middle Miocene)*
Type section, locality, area and/or origin of name:
Notable exposures in city of Astoria, OR, on south side of Coumbia River near its mouth. Formation has been folded into a syncline whose axis trends northwest through city of Astoria (Howe, 1926; Moore, 1963). [Exposures now inaccessible as result of urban development.]
"Best" stratigraphic section: ridge between Chehalis River and North River, [in T. 16 and 17 [N.], R. 7 W.], southwestern WA (Etherington, 1931).
Reference section: "Clemons section" (Etherington, 1931).
AAPG geologic province:
Oregon-Washington Coast Ranges 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 ([ ]).