USGS# M4638 - San Emigdio Fm, Kern County (Eocene of the United States)

Where: Kern County, California (35.1° N, 119.2° W: paleocoordinates 34.1° N, 108.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: San Emigdio Formation, Priabonian (38.0 - 33.9 Ma)

• The San Emigdio Formation conformably overlies the Tejon Formation, and is in turn overlain by the Pleito Formation. The San Emigdio Formation has a Late Eocene=refugian age=Priabonian.

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified sandstone

• The San Emigdio Formation is interpreted as a trangressive-regressive sequence. The coarse facies at the base of the formation presumably represent an initial transgressive phase. From upper part of the inner sublittoral (neritic) zone, 9-35 m deep.
• Marine sandstone. Appears to be mostly lithified from photos in publication. No detailed lithology or lithification comments mentioned in text.

Size class: macrofossils

Reposited in the USGS

Collection methods: quarrying,

• Collected by T.H. Nilson. Collections likely to be reposited at USGS Menlo Park or USNM (not specified).

Primary reference: T. H. Nilsen. 1987. Stratigraphy and sedimentology of the Eocene Tejon Formation, western Tehachapi and San Emigdio mountains, California. United States Geological Survey Professional Paper 1268:1-110 [A. Miller/A. Hendy/R. McClees-Funinan]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 52829: authorized by Austin Hendy, entered by Austin Hendy on 22.08.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Identified by W.O. Addicott.
Gastropoda
 Neogastropoda - Buccinidae
Siphonalia merriami Wagner and Schilling 1923 true whelk
 Neogastropoda - Siphonaliidae
Bruclarkia columbiana Anderson and Martin 1914 snail
 Sorbeoconcha - Ficidae
Ficus gesteri Wagner and Schilling 1923 fig shell
 Sorbeoconcha - Naticidae
Polinices cf. washingtonensis Weaver 1916 moon snail
"Neverita thomsonae" = Glossaulax reclusiana Deshayes 1839 moon snail
Bivalvia
 Cardiida - Mactridae
Mactromeris cf. pittsburgensis, "Spisula cf. rushi" = Mactromeris rushi, "Spisula cf. ramonensis" = Mactromeris ramonensis
"Spisula cf. rushi" = Mactromeris rushi Wagner and Schilling 1923 clam
"Spisula cf. ramonensis" = Mactromeris ramonensis Packard and Clark 1915 clam
 Cardiida - Cardiidae
Cardium sp. Linnaeus 1758 cockle
 Solenida - Solenidae
Solen sp. Linnaeus 1758 clam
 Nuculida - Nuculidae
"Acila shumardi" = Acila (Truncacila) shumardi
"Acila shumardi" = Acila (Truncacila) shumardi Dall 1909 divaricate nutclam
 Nuculanida - Yoldiidae
"Yoldia aff. tenuissima" = Yoldia (Kalayoldia) tenuissima
"Yoldia aff. tenuissima" = Yoldia (Kalayoldia) tenuissima Clark 1918 clam
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell