Energy Citations Database

Bibliographic Citation

 
Document
For copies of Journal Articles, please contact the Publisher or your local public or university library and refer to the information in the Resource Relation field.
For copies of other documents, please see the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or Document Availability.
Title New occurrence of Lower Eocene (Capay Stage) strata, lower Piru Creek, Topatopa Mountains, southern California
Creator/Author Squires, R.L. ; Yamashiro, D.A.
Publication Date1986 Apr 01
OSTI IdentifierOSTI ID: 7151675
Report Number(s)CONF-8604187-
Other Number(s)CODEN: AAPGB
Resource TypeConference
Specific TypeJournal Article
Resource RelationAm. Assoc. Pet. Geol., Bull. ; Vol/Issue: 70:4; American Association of Petroleum Geologist Pacific Section convention; 16 Apr 1986; Bakersfield, CA, USA
Research OrgCalifornia State Univ., Northridge
Subject020200 -- Petroleum-- Reserves, Geology, & Exploration; CALIFORNIA-- SILTSTONES;SILTSTONES-- GEOLOGY; GEOLOGIC FORMATIONS;GEOLOGIC HISTORY;TERTIARY PERIOD
Related SubjectCENOZOIC ERA;FEDERAL REGION IX;GEOLOGIC AGES;NORTH AMERICA;ROCKS;SEDIMENTARY ROCKS;USA
Description/Abstract A 900-m thick siltstone unit between Canton Canyon and Piru Creek, 16 km north of the town of Piru, California, previously was unnamed and considered as undifferentiated Eocene or middle Eocene in age.^The Siltstone unconformably overlies the Whitaker Peak granodiorite basement complex.^At the base of the siltstone is a veneer of gruss (weathered granodiorite).^The gruss is usually overlain by about a few meters of shoreface carbonaceous sandstone that grades vertically upward into transition-zone siltstone (500 m) with storm-deposit accumulations of macrofossils.^Collections made at 53 localities from these lower 500 m of strata yielded numerous shallow marine gastropods and bivalves, as well as specimens of discocyclinid foraminifers, colonial corals, calcareous worm tubes, and spataganoid echinoids.^This fauna is indicative of the West Coast provincial molluscan Capay Stage (lower Eocene).^Common age-diagnostic species are Turritella uvasana infera, T. Andersoni, and Ostrea haleyi.^Overlying and gradational with the transition-zone siltstone is 400 m of muddy siltstone with rare storm-deposit accumulations of macrofossils.^This muddy siltstone thickens westward and passes into deep-sea slope and inner-fan turbidite deposits.^Collections made at three localities in the muddy siltstone yielded many shallow marine gastropods and bivalves indicative of the Domengine stage (upper lower through lower middle Eocene).^Common age-diagnostic species are Turritella uvasana applinae and Pitar (Lamelliconcha) joaquinensis.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 479-480
System Entry Date2001 May 13

Top