Usage:
Roseburg Formation (OR)
Roseburg Formation of Umpqua Group (OR)
Geologic age:
Tertiary
Paleocene
Eocene, early
Type section, locality, area and/or origin of name:
Includes all of basalt and interbedded sedimentary rocks along North Fork of Umpqua River, between Frear Bridge, 3 mi west of Glide, to its confluence with South Fork, and in Red Hill anticline along U.S. Interstate Highway I-5 from Turkey Hill to center of syncline along Calapooya Creek, near Oakland, OR. Named from town of Roseburg, Douglas Co., OR (Baldwin, 1974).
AAPG geologic province:
Oregon-Washington Coast Ranges province
Klamath Mountains 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 ([ ]).