Also known as USGS 21649
Where: Ventura County, California (33.2° N, 119.5° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: Unnamed Formation, Middle Eocene to Middle Eocene (47.8 - 33.9 Ma)
• 3,500 feet of alternating marine sandstone and siltstone beds that contain minor amounts of interbedded conglomerate and pebbly mudstone. Is divided into 35 mapping units in Vedder and Norris (1963) but thestratigraphic location of the fossil collections are not indicated. Small andesite dikes of Miocene age intrude the Eocene strata. Dune sand and fossiliferous marine terrace deposits of Quaternary age overlie most of the Eocene strata. Bulk of the specific identifications suggest a middle to late Eocene age based on forms conspecific with those found in the Domengine Formation, the upper part of the Llajas Formation, the Rose Canyon shale member of the La Jolla Formation, and the Tejon Formation, all of whihc are considered to be in the upper half of the Eocene in Calfornia
• bed-level stratigraphic resolution
Environment/lithology: coastal; gray, conglomeratic mudstone and medium-grained, gray, conglomeratic sandstone
Size class: macrofossils
Reposited in the USGS
Collection methods: quarrying,
• Collected by Vedder et al. (1955, 1956). Earlier collections by Bowers (1890), Harbor and Reed (1933).
Primary reference: J. G. Vedder and R. M. Norris. 1963. Geology of San Nicolas Island, California. United States Geological Survey Professional Paper 369:1-65 [A. Miller/A. Hendy/P. Wagner]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 37928: authorized by Austin Hendy, entered by Austin Hendy on 27.03.2004
Creative Commons license: CC0 (CC0)
Taxonomic list
Tubulostium | |
Scaphopoda | |
Dentalium cooperi Gabb 1864 tusk shell | |
Bivalvia | |
"Ostrea aff. stewarti" = Phygraea stewarti
"Ostrea aff. stewarti" = Phygraea stewarti Hanna 1927 oyster | |
Gastropoda | |
Architectonica cf. ullreyana, "Architectonica cf. cognata" = Architectonica (Stellaxis) cognata
Architectonica cf. ullreyana Dickerson 1916 sundial
"Architectonica cf. cognata" = Architectonica (Stellaxis) cognata Gabb 1864 sundial | |
"Phos" cf. blakianus true whelk | |
Latirus cf. nightingalei Hanna 1927 snail
Fusinus aff. merriami Dickerson 1916 snail | |
Pleurofusia aff. lindavistaensis, Surculites cf. mathewsoni, ""Surcula" cf. praeattenuata" = Eosurcula praeattenuata
Surculites cf. mathewsoni turrid
""Surcula" cf. praeattenuata" = Eosurcula praeattenuata Gabb 1869 turrid | |
"? Cryptoconus cf. cooperi" = Turricula cooperi
"? Cryptoconus cf. cooperi" = Turricula cooperi Dickerson 1916 snail | |
""Volutocristata" cf. lajollaensis" = Lyrischapa, Lyria aff. andersoni
""Volutocristata" cf. lajollaensis" = Lyrischapa volute
Lyria aff. andersoni Waring 1917 volute | |
Amaurellina moragai, "Neverita cf. secta" = Glossaulax reclusiana, "Euspira cf. nuciformis" = Polinices (Euspira) nuciformis
Amaurellina moragai Stewart 1927 moon snail
"Neverita cf. secta" = Glossaulax reclusiana Deshayes 1839 moon snail
"Euspira cf. nuciformis" = Polinices (Euspira) nuciformis Gabb 1864 moon snail | |
? Globularia cf. hannabali, "Amaurellina clarki" = Pachycrommium clarki
"Amaurellina clarki" = Pachycrommium clarki Stewart 1927 snail | |
Loxotrema turritum Gabb 1869 snail | |
Potamides cf. carbonica horn snail | |
"Turritella lawsoni" = Turritella andersoni lawsoni, Turritella cf. buwaldana, Turritella uvasana, Turritella cf. uvasana
"Turritella lawsoni" = Turritella andersoni lawsoni Dickerson 1916 turret shell
Turritella cf. buwaldana Dickerson 1916 turret shell |