F122 - Santa Ana Mountains [Sespe/Vaqueros Fm] (Miocene of the United States)

Also known as USGS# 18477; K6

Where: Orange County, California (33.8° N, 117.7° W: paleocoordinates 32.8° N, 111.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• LITHOSTRATIGRAPHIC RELATIONS: From undifferentiated Sespe and Vaqueros Fms, which overlie the Santiago Fm (Eocene) and is overlain by the Topanga Fm (Middle Miocene). AGE: Late Eocene-Early Miocene, on the basis of vertebrate and molluscan biostratigraphy and stratigraphic correlations; most macrofossils come from the uppermost part of this undifferentiated unit and are suggested to be Early Miocene in age.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified sandstone

• ENVIRONMENT: Shallow marine environment.
• LITHOLOGY: Variable lithologies, but fossiliferous facies are predominantly sandstone. LITHIFICATION: Lithified, on the basis of facies description (in text).

Size class: macrofossils

Collected by Kinney, Schoelhammer, & Woodring; reposited in the USGS

Collection methods: surface (in situ),

• COLLECTORS: D.M. Kinney, J.E. Schoelhammer, & W.P. Woodring. REPOSITORY: USGS.

Primary reference: J. E. Schoellhamer, J. G. Vedder, R. F. Yerkes and D. M. Kinney. 1981. Geology of the Northern Santa Ana Mountains, California. United States Geological Survey Professional Paper 420(D):1-109 [J. Alroy/J. Alroy/R. McClees-Funinan]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 94854: authorized by Austin Hendy, entered by Austin Hendy on 31.03.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for mollusca and other macrofossil groups. NOMENCLATURE: Not an authoritative publication, but with relatively modern nomenclature and species-resolution identifications.
Maxillopoda
 Sessilia - Balanidae
Balanus sp. Da Costa 1778 barnacle
Bivalvia
 Arcida - Arcidae
 Mytilida - Mytilidae
Crenomytilus cf. expansus Arnold 1907 mussel
 Pholadida - Corbulidae
Corbula sp. Bruguière 1789 clam
 Cardiida - Veneridae
Dosinia margaritana Wiedey 1928 venus clam
Saxidomus aff. vaquerosensis Arnold 1909 venus clam
Tivela (Pachydesma) inezana Conrad 1849 venus clam
 Protobranchia - Nuculanidae
Saccella sp. Woodring 1925 pointed nut clam
Gastropoda
 Neogastropoda - Muricidae
"Ocenebra topangensis" = Ocinebra topangensis
"Ocenebra topangensis" = Ocinebra topangensis Arnold 1907 murex snail
 Neogastropoda - Terebridae
Terebra santana Loel and Corey 1932 auger snail
 Calyptraeoidea - Calyptraeidae
Calyptraea (Trochita) filosa Gabb 1866 slipper shell
 Sorbeoconcha - Turritellidae
"Turritella (Torcula) inezana" = Torcula
"Turritella (Torcula) inezana" = Torcula turret shell
SUBSPECIES: Turritella (Torcula) inezana santana