USGS# M4634 - Tejon Fm, Kern County (Eocene of the United States)

Where: Kern County, California (34.9° N, 118.8° W: paleocoordinates 34.5° N, 106.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Tejon Formation, Bartonian (41.3 - 38.0 Ma)

• From upper Tejon Formation, and most likely from "Tejon" stage, or possibly the "Transition" stage. Therefore a upper Middle Eocene=Narizian=Bartonian age is assigned to the collection, although it is possibly as old as Lutetian. The Tejon Formation unconformably overlies basement, and is unconformably overlain by the Tecuya Formation (Oligocene) in this section. About 58 m stratigraphically below top of undivided Tejon Formation. It is not specified which member of the Tejon Formation the collection is derrived.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, shelly/skeletal sandstone

• Representative of sandy level bottom communities, and somewhat greater depths than the inner sublittoral zone (low tide to around 90 m).
• From cross-stratified sandstone, with some shell debris. 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 52827: authorized by Austin Hendy, entered by Austin Hendy on 22.08.2005, edited by Susan Tremblay

Creative Commons license: CC BY (attribution)

Taxonomic list

• Identified by W.O. Addicott.
Bivalvia
 Nuculanida - Nuculanidae
"Nuculana cf. gabbi" = Nuculana gabbii
"Nuculana cf. gabbi" = Nuculana gabbii Conrad 1866 pointed nut clam
 Mytilida - Crenellidae
Musculus sp. Roding 1798 mussel
"possibly Brachydontes ornatus"
 Arcida - Arcidae
Barbatia cf. suzzalloi Weaver and Palmer 1922 clam
"Halonanus horni" = Pachecoa hornii Gabb 1864 clam
 Cardiida - Cardiidae
"Schedocardia breweri" = Schedocardia brewerii, "Nemocardium linteum" = Nemocardium (Nemocardium) linteum
"Schedocardia breweri" = Schedocardia brewerii Gabb 1864 cockle
"Nemocardium linteum" = Nemocardium (Nemocardium) linteum Conrad 1855 cockle
 Cardiida - Tellinidae
Tellinidae indet. Blainville 1814 tellin clam
Macoma viticola Anderson and Hanna 1925 tellin clam
 Cardiida - Mactridae
"Spisula cf. bisculpturata" = Mactromeris bisculpturata, "Spisula merriami" = Mactromeris merriami
"Spisula cf. bisculpturata" = Mactromeris bisculpturata Anderson and Hanna 1925 clam
"Spisula merriami" = Mactromeris merriami Packard 1916 clam
 Cardiida - Veneridae
? Macrocallista sp. Meek 1876 venus clam
Pitar uvasana Conrad 1855 venus clam
Scaphopoda
 Dentaliida - Dentaliidae
? Dentalium sp. Linnaeus 1758 tusk shell
Gastropoda
 Heterostropha - Pyramidellidae
? Turbonilla sp. Risso 1826 snail
Pyramidella mucronis Anderson and Hanna 1925 snail
 Neotaenioglossa - Calyptraeidae
Calyptraea sp. Lamarck 1799 slipper shell
 Neogastropoda - Ptychatractidae
Exilia "sp. A" Conrad 1860 snail
Exilia "sp. B" Conrad 1860 snail
Exilia fausta Anderson and Hanna 1925 snail
 Neogastropoda - Cancellariidae
Bonellitia paucivaricata Gabb 1864 snail
 Neogastropoda - Olividae
"Olivella mathewsoni" = Olivella mathewsonii
"Olivella mathewsoni" = Olivella mathewsonii Gabb 1864 olive snail
 Neogastropoda - Turridae
Turridae indet. Swainson 1840 turrid
 Neogastropoda - Fasciolariidae
Whitneyella sinuata Gabb 1864 snail
 Sorbeoconcha - Naticidae
Naticidae indet. Guilding 1834 moon snail
"Amauropsis alveata" = Amaurellina moragai Stewart 1927 moon snail
Neverita sp. Risso 1826 moon snail
 Cerithioidea - Turritellidae
Turritella buwaldana Dickerson 1916 turret shell
Turritella uvasana Conrad 1855 turret shell
 Patellida - Acmaeidae
Acmaeidae indet. Forbes 1850 limpet
 Patellida - Lottiidae
Patelloida tejonensis Gabb 1869 limpet
Acmaea cf. ruckmani Dickerson 1916 limpet