USGS# M4630 - 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. It is not specified which of three members this collection is from.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified sandstone

• Collections from this section are generally typical of sandy level bottom communities, and somewhat greater depths than the inner sublittoral zone (low tide to around 90 m).
• While this collection is not specifically placed in measured section, all other collections are derived from marine sandstones. 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 52803: 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.
Lingulata
 Discinida - Disciniidae
Discinisca sp. Gray 1840
Gastropoda
 Lepetellida - Fissurellidae
Fissurella aff. behri Dickerson 1914 snail
 Neotaenioglossa - Calyptraeidae
Calyptraea cf. diegoana Conrad 1855 slipper shell
 Sorbeoconcha - Naticidae
? Naticidae indet., "Amauropsis alveata" = Amaurellina moragai
? Naticidae indet. Guilding 1834 moon snail
"Amauropsis alveata" = Amaurellina moragai Stewart 1927 moon snail
 Neogastropoda - Conidae
Conus cf. remondii Gabb 1864 cone shell
[entered as Conus remondi]
 Neogastropoda - Olividae
? Olivella sp. Swainson 1831 olive snail
 Neogastropoda - Muricidae
Pseudoperissolax blakei Conrad 1855 murex snail
Bivalvia
 Mytilida - Mytilidae
"Brachiodontes ornatus" = Brachidontes (Brachidontes) cowlitzensis
"Brachiodontes ornatus" = Brachidontes (Brachidontes) cowlitzensis Weaver and Palmer 1922 mussel
[entered as Brachydontes ornatus]
 Pectinida - Pectinoidae
Spondylus carlosensis Anderson 1905 scallop
 Pectinida - Limidae
Lima sp. Bruguière 1797 file clam
 Ostreida - Ostreidae
? Ostrea sp. Linnaeus 1758 oyster
 Arcida - Arcidae
"Halonanus horni" = Pachecoa hornii
"Halonanus horni" = Pachecoa hornii Gabb 1864 clam
 Cardiida - Cardiidae
"Schedocardia breweri" = Schedocardia brewerii
"Schedocardia breweri" = Schedocardia brewerii Gabb 1864 cockle
 Cardiida - Tellinidae
Tellina sp. Linnaeus 1758 tellin clam
 Cardiida - Psammobiidae
"Gari hornii" = Gari (Gobraeus) hornii Gabb 1864 clam
Gari cf. diegoensis Hanna 1927 clam
 Cardiida - Veneridae
Macrocallista sp. Meek 1876 venus clam
 Cardiida - Mactridae
"Spisula cf. acutirostrata" = Mactromeris acutirostrata
"Spisula cf. acutirostrata" = Mactromeris acutirostrata Packard 1916 clam
 Pholadida - Corbulidae
Corbula sp. Bruguière 1789 clam
 Carditida - Crassatellidae
Crassatella sp. Lamarck 1799 clam
 Carditida - Carditidae
Venericardia sp. Lamarck 1801 clam
Anthozoa
  -
Anthozoa indet. Ehrenberg 1834