- Usage in publication:
-
- Tenmile Member
- Modifications:
-
- Named
- Dominant lithology:
-
- Sandstone
- Siltstone
- AAPG geologic province:
-
- Oregon-Washington Coast Ranges province
- Klamath Mountains province
Summary:
Named as middle member (of 3) of Lookingglass Formation (new). Best displayed in broad east-trending Tenmile Valley from community of Tenmile to Olalla Creek in Camas Valley 15' quad, Douglas Co., OR. Is also exposed at Remote in lower Sandy Creek Valley, along Bear Creek, along East Fork of Coquille River, and along Rock Creek. Composed of thin rhythmically-bedded, dark gray-brown, fine-grained sandstone and siltstone. Is approximately 3200 ft thick at Tenmile. Overlies the Bushnell Rock Member; underlies the Olalla Creek Member (both new and of Lookingglass Formation). Age is early and middle Eocene (Penutian) based on fossils [foraminifers] identified by Thoms (1965) and age of Lookingglass Formation.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Tenmile Member
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Oregon-Washington Coast Ranges province
- Klamath Mountains province
Summary:
Tenmile Member of Lookingglass Formation of Baldwin (1974) included in the Umpqua Group. [author discusses reasons for raising rank of the Umpqua]. Shown in stratigraphic column at north Umpqua River, OR. Age given as Eocene (Penutian) based on fossils [foraminifers].
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Tenmile Member
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Oregon-Washington Coast Ranges province
- Klamath Mountains province
Summary:
Tenmile Member of Lookingglass Formation of Baldwin (1974) is reassigned as second lowest member (of 4) of Umpqua Formation. Conformably overlies the Bushnell Rock Member of Umpqua Formation. To the north where the Bushnell Rock Member is absent includes sedimentary rocks of Baldwin's (1974) Roseburg Formation [Members of the Umpqua Formation are not adopted in this paper; the Lookingglass and Roseburg Formations are not recognized].
Source: GNU records (USGS DDS-6; Menlo GNULEX).
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 ([ ]).