USGS# M4598 - San Emigdio Fm, Kern County (Eocene of the United States)

Where: Kern County, California (35.0° N, 119.3° W: paleocoordinates 34.0° N, 108.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• Heteromacoma bed 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. Stratigraphically lowest collection amongst M4595-M4598.

• 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.
• Presumably from lower 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 52802: 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.
Show authors, comments, and common names
Gastropoda
 Neogastropoda - Buccinidae
? Siphonalia sp.
? Siphonalia sp. Adams 1863 true whelk
 Sorbeoconcha - Naticidae
"Neverita aff. thomsonae" = Glossaulax reclusiana
"Neverita aff. thomsonae" = Glossaulax reclusiana Deshayes 1839 moon snail
Bivalvia
 Nuculanida - Yoldiidae
? Yoldia sp.
? Yoldia sp. Möller 1842 clam
 Cardiida - Veneridae
? Amiantis sp.
? Amiantis sp. Carpenter 1863 venus clam
 Cardiida - Mactridae
"Spisula cf. packardi" = Pseudocardium packardi
"Spisula cf. packardi" = Pseudocardium packardi Dickerson 1917 clam