UCMP loc. A-540, San Joaquin Hills (Miocene of the United States)

Where: Orange County, California (33.6° N, 117.8° W: paleocoordinates 32.6° N, 111.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Vaqueros Formation, Early/Lower Miocene (23.0 - 16.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Vaqueros Fm, which unconformably overlies the Eocene Tempetate/Martinez Fm, and is overlain by the Temblor Fm (Middle Miocene). THICKNESS: From bed within unit which locally reaches 500 ft in thickness. AGE: Early Miocene on the basis of molluscan biostratigraphy. STRATIGRAPHIC POSITION: From the upper part of the Vaqueros Fm.

• bed-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, silty sandstone

• ENVIRONMENT: From rather shallow siliciclastic marine facies on the basis of faunal composition.
• SPECIFIC LITHOLOGY: Light colored sandstones and silty sandstones. LITHIFICATION: Poorly lithified on the basis of facies description of adjacent strata and age.

Size class: macrofossils

Reposited in the UCMP

Collection methods: surface (in situ),

• COLLECTOR: W. Loel, W. H. Corey, and A. M. Strong (c. late 1910-20's). REPOSITORY: University of California, Berkeley (UCNMP).

Primary reference: W. Loel and W. H. Corey. 1932. The Vaqueros Formation, Lower Miocene of California (Part 1). University of California Publications, Bulletin of the Department of Geological Sciences 22(3):31-410 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 71221: authorized by Austin Hendy, entered by Austin Hendy on 21.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for bivalvia and gastropoda, with annelida, bryozoa, crustacea, and pisces also listed. NOMENCLATURE: Antiquated nomenclature, but from authoritative publication with consistent use of species and subgenus-level assignments.
Bivalvia
 Pectinida - Pectinoidae
"Pecten (Lyropecten) miguelensis" = Lyropecten miguelensis
"Pecten (Lyropecten) miguelensis" = Lyropecten miguelensis Arnold 1906 scallop
 Pectinida - Anomiidae
Anomia vaquerosensis n. sp. Loel and Corey 1932 jingle
 Cardiida - Veneridae
"Chione aff. richthofeni" = Chione (Chionopsis) richthofeni
"Chione aff. richthofeni" = Chione (Chionopsis) richthofeni Hertlein and Jordan 1927 venus clam
Gastropoda
 Neogastropoda - Cancellariidae
"Cancellaria dalliana" = Cancellaria (Euclia) dalliana
"Cancellaria dalliana" = Cancellaria (Euclia) dalliana Anderson 1905 snail
 Neogastropoda - Muricidae
Purpura topangensis Arnold 1907 murex snail
 Opisthobranchia - Cylichnidae
Scaphander jugularis Conrad 1855 snail
Thecostraca
 Balanomorpha - Balanidae
Balanus sp. Da Costa 1778 barnacle