- Usage in publication:
-
- Towsley formation
- Modifications:
-
- First used
- AAPG geologic province:
-
- Los Angeles basin
Summary:
First use of the Towsley formation. Previously included in the Modelo Formation by Kew (1924).
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Towsley formation
- Modifications:
-
- Continued use
- AAPG geologic province:
-
- Ventura basin
Summary:
Continued usage of the Towsley. Name not approved by U.S.G.S.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Towsley formation*
- Modifications:
-
- Named
- Biostratigraphic dating
- Dominant lithology:
-
- Sandstone
- Mudstone
- Conglomerate
- AAPG geologic province:
-
- Ventura basin
Summary:
Unit is named the Towsley formation, for exposures in Towsley Canyon [Los Angeles Co.], CA. Parts of unit have previously been included in the Modelo, Pico, and Repetto Formations. Consists of light-colored sand-stones and conglomerates and brown-weathering mudstones. Thickness is 4,000 ft in the southwestern part of the study area and thin eastward. [Conformably] overlies and interfingers with the Modelo Formation; [conformably] underlies the Pico Formation. Age is late Miocene and early Pliocene based on fossils [foraminifers, megafossils] and stratigraphic relations.
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 ([ ]).