Usage:
Alsea Formation (OR*)
Geologic age:
early Tertiary (late Eocene to Oligocene)*
Type section, locality, area and/or origin of name:
Type section: lower part of formation is on north side of Alsea Bay; upper part is on south side of Alsea Bay, in secs. 17, 18, 19, and 20, T. 13 S., R. 12 W., Lincoln Co., northwestern OR. Named from exposures along shores of Alsea Bay (Snavely and others, 1975).
Reference section: outcrops and roadcuts along northern side of Yaquina River, in NE/4 sec. 35 to SW/4 sec. 26, T. 11 S., R. 11 W., Lincoln Co., northwestern OR (Snavely and others, 1975).
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 ([ ]).