F100 - Santa Ana Mountains [Santiago Fm] (Eocene of the United States)

Also known as USGS# 18993; S34

Where: Orange County, California (33.8° N, 117.7° W: paleocoordinates 34.0° N, 104.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Santiago Formation, Middle Eocene (48.6 - 37.2 Ma)

• LITHOSTRATIGRAPHIC RELATIONS: From the Santiago Fm, which overlies the Silverado Fm (Paleocene) and is overlain by the Sespe and Vaqueros Fms (Eocene-E. Miocene). AGE: Middle Eocene, on the basis of molluscan and foraminiferal biostratigraphy; from the Ulatisian Stage of Mallory (1959), on the basis of benthic forams and the Discosaster sublodoensis nannoplankton zone (Poore, 1976).

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, pebbly sandstone and lithified, concretionary siltstone

• ENVIRONMENT: Shallow marine environment.
• LITHOLOGY: Pebbly sandstone, conglomerate, sandstone and siltstone. LITHIFICATION: Lithified, on the basis of facies description (in text).

Size class: macrofossils

Collected by Schoelhammer; reposited in the USGS

Collection methods: surface (in situ),


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 94821: authorized by Austin Hendy, entered by Austin Hendy on 29.03.2010

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.
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Mytilida - Mytilidae
Brachidontes cf. cowlitzensis Weaver and Palmer 1922 mussel
 Carditida - Carditidae
 Cardiida - Veneridae
? Pitar sp. Römer 1857 venus clam
 Cardiida - Cardiidae
"Nemocardium linteum" = Nemocardium (Nemocardium) linteum
"Nemocardium linteum" = Nemocardium (Nemocardium) linteum Conrad 1855 cockle
 Thraciida - Thraciidae
 Opisthobranchia - Cylichnidae
"Scaphander (Mirascapha) cf. costatus" = Scaphander costatus
"Scaphander (Mirascapha) cf. costatus" = Scaphander costatus Gabb 1864 snail
 Neogastropoda - Melongenidae
"Ficopsis cooperiana" = Fusus (Hemifusus) cooperii
"Ficopsis cooperiana" = Fusus (Hemifusus) cooperii Gabb 1864 snail
 Neogastropoda - Mitridae
 Neogastropoda - Turridae
? Protosurcula sp. Casey 1904 turrid
 Neogastropoda - Conidae
 Stromboidea - Strombidae
"Ectinochilus (Cowlitzia) cf. supraplicatus" = Rimella
"Ectinochilus (Cowlitzia) cf. supraplicatus" = Rimella true conch
 Ficoidea - Ficidae
"Pseudoperissolax cf. blakei" = Perissolax blakei, Ficopsis redmondii
"Pseudoperissolax cf. blakei" = Perissolax blakei Conrad 1855 fig shell
SUBSPECIES: Pseudoperissolax cf. blakei praeblakei
Ficopsis redmondii fig shell
SUBSPECIES: Ficopsis redmondii crescentensis
 Sorbeoconcha - Turritellidae
Turritella uvasana Conrad 1855 turret shell
 Sorbeoconcha - Cerithiidae