USGS# M4595 - 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)

• From upper 9 m of fossiliferous section below yellow sandstone, near base of San Emigdio Formation. 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 and W.O. Addicott. 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 52799: authorized by Austin Hendy, entered by Austin Hendy on 21.08.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Identified by W.O. Addicott.
Gastropoda
 Epitonioidea - Epitoniidae
Epitonium sp. Bolten 1798 wentletrap
 Neogastropoda - Buccinidae
Siphonalia merriami Wagner and Schilling 1923 true whelk
 Neogastropoda - Siphonaliidae
Bruclarkia columbiana Anderson and Martin 1914 snail
 Neogastropoda - Nassariidae
Bullia clarki Wagner and Schilling 1923 snail
 Neogastropoda - Fasciolariidae
Perse sp. Clark 1918 snail
 Neogastropoda - Ptychatractidae
? Exilia sp. Conrad 1860 snail
 Sorbeoconcha - Bursidae
Olequahia lorenzana Wagner and Schilling 1923 frog shell
 Sorbeoconcha - Naticidae
"Neverita aff. thomsonae" = Glossaulax reclusiana
"Neverita aff. thomsonae" = Glossaulax reclusiana Deshayes 1839 moon snail
Bivalvia
 Mytilida - Mytilidae
Modiolus sp. Lamarck 1801 mussel
 Cardiida - Veneridae
Amiantis sp. Carpenter 1863 venus clam
 Cardiida - Mactridae
"Spisula cf. rushi" = Mactromeris rushi, "Spisula cf. packardi" = Pseudocardium packardi
"Spisula cf. rushi" = Mactromeris rushi Wagner and Schilling 1923 clam
"Spisula cf. packardi" = Pseudocardium packardi Dickerson 1917 clam
 Cardiida - Cardiidae
Cardiidae indet. Lamarck 1809 cockle
 Nuculanida - Yoldiidae
? Yoldia sp. Möller 1842 clam