- Usage in publication:
-
- Scio formation, beds
- Modifications:
-
- Named
- Biostratigraphic dating
- Dominant lithology:
-
- Sandstone
- Tuff
- Breccia
- AAPG geologic province:
-
- Cascades province
Summary:
Named credited to Felts (1936, unpub. thesis). Named for town of Scio, 9 mi southeast of Jefferson on HWY 99. Well exposed in eastern part of Lebanon 15' quad, Linn Co, OR. Beds consist of series of sandstones and water-lain tuffs and breccias. Vary from very fine-grained white tuffaceous shale through quartz-mica sandstone containing as much as 96% quartz. On Franklin Butte formation is more tuffaceous with about 75 ft containing well-defined white sandy shale including fossil leaves. Beds apparently overlie marine Oligocene (Eugene) formation, but exact relationship is questionable because no contacts were observed; beds unconformably underlie series of basic lava flows that are presumably middle Miocene in age. Age is late Oligocene and early Miocene based on ages of fossil flora.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Scio bedsâ€
- Modifications:
-
- Abandoned
- AAPG geologic province:
-
- Cascades province
Summary:
Tentative names 'Scio beds" and "Berlin volcanics" used by Felts (1936, unpub. thesis) are abandoned in favor of Mehama volcanics.
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 ([ ]).