- Usage in publication:
-
- Edna Member
- Modifications:
-
- Named
- Biostratigraphic dating
- Dominant lithology:
-
- Sandstone
- Dolomite
- Conglomerate
- AAPG geologic province:
-
- California Coast Ranges province
Summary:
Named as lowermost member (of 5) of Pismo Formation. Type section designated between 0.5 and 2 mi south of Edna near Edna oil field and along northwest side of Pismo Creek, T31-32S R13E, Arroyo Grande NE 7.5' and Pismo Beach 7.5' quads, San Luis Obispo Co, CA. Consists of bituminous and nonbituminous sandstone with dolomite and conglomerate. Thickness is 1450 feet. Disconformably overlies Monterey Formation; interfingers with or underlies Miguelito Member (new) (Pismo Formation); unconformably underlies Squire Member (new) (Pismo Formation). Based on megafossils age is late Miocene and early Pliocene.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Edna Member*
- Modifications:
-
- Adopted
- AAPG geologic province:
-
- California Coast Ranges province
Summary:
Edna Member of Pismo Formation of Hall (1973a) adopted. Shown on geologic map of Morro Bay South and Port San Luis 7.5' quads, San Luis Obispo Co, CA, undivided with Miguelito Member (Pismo Formation). Four lithologies are shown separately. Age is Miocene and Pliocene based on fossils, some collected in adjoining Arroyo Grande 15' quad (Hall, 1973a).
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 ([ ]).