UC-A535 - Vaqueros Fm (Miocene of the United States)

Where: Orange County, California (33.7° N, 117.8° W: paleocoordinates 32.7° N, 111.5° 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 top of the Vaqueros/Temblor transition zone, in 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 71218: 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.
Maxillopoda
 Sessilia - Balanidae
Balanus sp. Da Costa 1778 barnacle
Polychaeta
 Sabellida - Serpulidae
Bivalvia
 Arcida - Arcidae
Arca (Barbatia) strongi n. sp. Loel and Corey 1932 clam
Arca (Anadara) santana n. sp. Loel and Corey 1932 ark
 Pectinida - Anomiidae
Anomia vaquerosensis n. sp. Loel and Corey 1932 jingle
 Cardiida - Ungulinidae
Diplodonta cf. orbella Gould 1851 clam
 Cardiida - Veneridae
Clementia (Egesta) pertenuis Gabb 1864 venus clam
SUBSPECIES: C. (E.) pertenuis conradiana
 Cardiida - Solecurtidae
Tagelus clarki n. sp. Loel and Corey 1932 clam
Gastropoda
 Neogastropoda - Olividae
Olivella santana n. sp. Loel and Corey 1932 olive snail
 Calyptraeoidea - Calyptraeidae
Crepidula diminutiva n. sp. Loel and Corey 1932 slipper shell
 Sorbeoconcha - Turritellidae
Turritella inezana turret shell
SUBSPECIES: T. inezana bicarina