UCMP Loc. 6128, Arroyo Trabuco, Santa Ana Mountains (Miocene of the United States)

Where: Orange County, California (33.6° N, 117.6° W: paleocoordinates 32.7° N, 111.4° 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 Turritella inezana zone in the 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. H. Corey, C. D. Meserve, R. E. Dickerson, and W. S. W. Kew (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 71228: 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.
Gastropoda
 Neotaenioglossa - Calyptraeidae
Crepidula diminutiva Loel and Corey 1932 slipper shell
Calyptraea filosa Gabb 1866 slipper shell
Calyptraea inornata Gabb 1869 slipper shell
 Cerithioidea - Cerithiidae
"Cerithium topangensis" = Bittium topangensis, "Terebra santana n. sp." = Clavocerithium santana
"Cerithium topangensis" = Bittium topangensis Arnold 1907 cerith snail
"Terebra santana n. sp." = Clavocerithium santana Loel and Corey 1932 cerith snail
 Cerithioidea - Turritellidae
Turritella inezana Conrad 1857 turret shell
COMMENTS: Multiple subspecies
 Neogastropoda - Olividae
Olivella santana n. sp. Loel and Corey 1932 olive snail
 Neogastropoda - Muricidae
"Rapana vaquerosensis" = Califrapana vaquerosensis, "Purpura milicentana n. sp." = Ocenebra milicentana
"Rapana vaquerosensis" = Califrapana vaquerosensis Arnold 1908 murex snail
COMMENTS: Includes R. vaquerosensis imperialis
"Purpura milicentana n. sp." = Ocenebra milicentana Loel and Corey 1932 murex snail
 Neogastropoda - Volutidae
Voluta sp. Linnaeaus 1758 volute
 Sorbeoconcha - Naticidae
Bivalvia
 Arcida - Arcidae
"Arca (Anadara) santana n. sp." = Anadara santana
"Arca (Anadara) santana n. sp." = Anadara santana Loel and Corey 1932 ark
 Pectinida - Pectinoidae
"Pecten (Lyropecten) bowersi" = Vertipecten bowersi, "Pecten (Lyropecten) miguelensis" = Lyropecten miguelensis
"Pecten (Lyropecten) bowersi" = Vertipecten bowersi Arnold 1906 scallop
"Pecten (Lyropecten) miguelensis" = Lyropecten miguelensis Arnold 1906 scallop
SUBSPECIES: P. (L.) miguelensis submiguelensis
 Ostreida - Malleidae
"Pedalion cf. panzana" = Isognomon (Isognomon) panzana
"Pedalion cf. panzana" = Isognomon (Isognomon) panzana Loel and Corey 1932 oyster
 Ostreida - Gryphaeidae
"Ostrea eldridgei" = Crenostrea eldridgei
"Ostrea eldridgei" = Crenostrea eldridgei Arnold 1907 oyster
 Lucinida - Lucinidae
Lucina wattsi Loel and Corey 1932 clam
 Pholadida - Myidae
? Mya sp. Linnaeus 1758 softshell clam
 Cardiida - Veneridae
Saxidomus sp. Conrad 1837 venus clam
Clementia (Egesta) pertenuis Gabb 1864 venus clam
SUBSPECIES: C. (E.) pertenuis
Tivela (Pachydesma) inezana Conrad 1856 venus clam
"Chione aff. richthofeni" = Chione (Chionopsis) richthofeni Hertlein and Jordan 1927 venus clam
Dosinia santana n. sp. Loel and Corey 1932 venus clam
 Cardiida - Cardiidae
"Cardium (Trachycardium) vaquerosensis" = Dallocardia vaquerosense
"Cardium (Trachycardium) vaquerosensis" = Dallocardia vaquerosense Arnold 1908 cockle
 Cardiida - Tellinidae
"Metis aff. alta" = Leporimetis obesa
"Metis aff. alta" = Leporimetis obesa Deshayes 1855 tellin clam
 Cardiida - Psammobiidae
"Sanguinolaria cf. toulai" = Nuttallia toulai
"Sanguinolaria cf. toulai" = Nuttallia toulai Hertlein and Jordan 1927 clam
Gymnolaemata
 Cheilostomata -
Thecostraca
 Balanomorpha - Balanidae
Balanus sp. Da Costa 1778 barnacle
Echinoidea
 Clypeasteroida - Echinarachniidae
"Scutella vaquerosensis" = Vaquerosella vaquerosensis
"Scutella vaquerosensis" = Vaquerosella vaquerosensis Kew 1920 sand dollar
 Clypeasteroida - Scutellidae