Usage:
Ashton zone (informal) (CA)
Recognized locally in subsurface of Huntington Beach area.
Informal. The rank or lithologic term should not be capitalized.
Geologic age:
late Tertiary (Pliocene)
Type section, locality, area and/or origin of name:
[Named from Eddystone Oil Company (later Shell Oil Company) "Ashton" No. 1 well, Huntington Beach oil field, Orange Co., southern CA. See O.P. Jenkins and others, 1943 (California Div. Mines Geol. Bull., no. 118, p. 20, 220, 230, 234-235 (pl. 5), 329-331, 673).]
AAPG geologic province:
Los Angeles basin
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 ([ ]).