CSUN Loc. 548, Simi Arroyo: Lutetian, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
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Palaeopinnixa aff. rathburnae
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Malacostraca
- Decapoda
- Raninidae
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Raninoides slaki n. sp.
Squires 2001
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Malacostraca
- Decapoda
- Cymonomidae
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Eonomus californianus n. gen., n. sp.
Nyborg et al. 2017
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Nyborg et al. 2017 | |||||||||
Malacostraca
- Decapoda
- Euryplacidae
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Glyphithyreus weaveri
(Rathbun 1926)
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Squires 1984 | |||||||||
recombined as Orbitoplax weaveri | ||||||||||
Malacostraca
- Decapoda
- Carcinidae
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Portunites insculpta
Rathbun 1926
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Malacostraca
- Decapoda
- Scyllaridae
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Parribacus caesius n. sp.
Squires 2001
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recombined as Llajassus caesius | ||||||||||
Cephalopoda
- Nautilida
- Nautilidae
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Kummelonautilus sp.
Matsumoto 1984
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Scaphopoda
- Dentaliida
- Dentaliidae
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Dentalium (Laevidentalium) calafium
Vokes 1939
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Squires 1984 | |||||||||
Gastropoda
- Turritellidae
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Turritella buwaldana
Dickerson 1916
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Squires 1984 | |||||||||
Turritella andersoni
Dickerson 1916
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Squires 1984 | |||||||||
as Turritella andersoni lawsoni | ||||||||||
Turritella uvasana
Conrad 1855
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Squires 1984 | |||||||||
as Turritella uvasana applinae | ||||||||||
Gastropoda
- Neotaenioglossa
- Calyptraeidae
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Calyptraea diegoana
(Conrad 1855)
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Squires 1984 | |||||||||
Gastropoda
- Strombidae
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Platyoptera pacifica
Squires and Demetrion 1990
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Gastropoda
- Neogastropoda
- Clathurellidae
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Domenginella claytonensis
(Gabb 1864)
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Squires 1984 | |||||||||
Gastropoda
- Neogastropoda
- Clavatulidae
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Fusiturricula (Crenaturricula) crenatospira
(Cooper 1894)
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Squires 1984 | |||||||||
recombined as Crenaturricula crenatospira | ||||||||||
as Fusiturricula (Crenaturricula) crenatospira domenginica | ||||||||||
Bivalvia
- Ostreida
- Ostreidae
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Ostrea idriaensis
Gabb 1869
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Squires 1984 | |||||||||
recombined as Acutostrea idriaensis | ||||||||||
Bivalvia
- Ostreida
- Pinnidae
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Pinna lewisi
Waring 1914
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Squires 1984 | |||||||||
recombined as Pinna (Pinna) lewisi | ||||||||||
Bivalvia
- Ostreida
- Pteriidae
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Pteria pellucida
(Gabb 1864)
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original and current combination Avicula pellucida | ||||||||||
Bivalvia
- Cardiida
- Cardiidae
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Nemocardium linteum
(Conrad 1855)
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Squires 1984 | |||||||||
recombined as Nemocardium (Nemocardium) linteum | ||||||||||
Acanthocardia (Schedocardia) brewerii
(Gabb 1864)
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Squires 1984 | |||||||||
recombined as Schedocardia brewerii | ||||||||||
Bivalvia
- Cardiida
- Psammobiidae
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Gari texta
Gabb 1864
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recombined as Gari (Gobraeus) texta | ||||||||||
Bivalvia
- Cardiida
- Gastrochaenidae
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Gastrochaena ? dubitata
Hanna 1927
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Bivalvia
- Carditida
- Carditidae
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Venericardia (Pacificor) hornii
(Gabb 1864)
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Squires 1984 | |||||||||
as Venericardia (Pacificor) hornii calafia | ||||||||||
Rhynchonellata
- Terebratulida
- Terebrataliidae
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Terebratalia aff. batequia
Sandy et al. 1995
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Chondrichthyes
- Myliobatiformes
- Myliobatidae
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? Myliobatis sp.
Cuvier 1816
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Echinoidea
- Camarodonta
- Temnopleuridae
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? Brochopleurus sp.
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Anthozoa
- Scleractinia
- Caryophylliidae
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Trochocyathus stantoni
Vaughan 1900
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Asterocyclinidae
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Pseudophragmina (Proporocyclina) clarki
(Cushman 1920)
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Squires 1984 | |||||||||
recombined as Pseudophragmina clarki | ||||||||||
see common names |
Geography
Country: | United States | State/province: | California | County: | Ventura |
Coordinates: | 34.3° North, 118.7° West (view map) | ||||
Paleocoordinates: | 35.0° North, 104.7° West | ||||
Basis of coordinate: | estimated from map | ||||
Altitude: | 288 meters | ||||
Geographic resolution: | outcrop |
Time
Period: | Paleogene | Epoch: | Eocene |
Stage: | Lutetian | 10 m.y. bin: | Cenozoic 2 |
Key time interval: | Lutetian | ||
Age range of interval: | 47.80000 - 41.20000 m.y. ago |
Stratigraphy
Formation: | Llajas | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: Immediately below the "Stewart Bed", middle of the Llajas Formation, "Domengine" stage, top of CP12a calcareous nannoplankton zone, lower Lutetian stage, Middle Eocene, C21r chron. |
Lithology and environment
Primary lithology: | lithified argillaceous siltstone |
Secondary lithology: | planar lamination,bioturbation sandstone |
Includes fossils? | Y |
Includes fossils? | Y |
Lithology description: Alternating laminated and bioturbated sandstones grading into muddy siltstone. | |
Environment: | transition zone/lower shoreface |
Glacial or sequence phase: | transgressive |
Geology comments: The "Stewart bed" is located in a section of transition from shallow-marine to outer slope and shelf facies. A nearshore environment is interpreted for that portion of the shallow-marine (transgressive) facies which consists of laminated beds alternating with bioturbated beds. In such cases, the finely laminated sand represents storm-influenced stratification, and the biogenic reworking is the inter-storm activity. Shell fragments commonly are concentrated as channel lags in surge channels. Fossils were apparently subjected to wave action because the apices of elongate shells such as Turritella are bimodally oriented in opposite directions. The deeper the water, the less amount of laminated sandstone and the more amount of bioturbated sandstone. Such areas, which were farther below effective wave base, existed 1) where the shallow-marine (transgressive) facies grades into the outer shelf to slope facies and 2) in the shallow-marine (regressive) facies. One of the deepest-water shallow-marine beds was the "Stewart bed." |
Taphonomy
Modes of preservation: | body,mold/impression |
Size of fossils: | macrofossils |
Preservation of anatomical detail: | medium |
Collection methods and comments
Collection methods: | field collection,survey of museum collection |
Reason for describing collection: | taxonomic analysis |
Museum repositories: | LACM |
Collection method comments: Collected by R.L. Squires, (1978) and CSUN paleontology classes in the 1980's-1990's and G. Slak (1997-1998) | |
Taxonomic list comments:Exhaustive for mollusca, corals, arthropoda, and includes other groups where obvserved; list compiled from meticulous search of the invert collections at the LACM, private collections and fieldwork. |
Metadata
Database number: | 51922 | ||
Authorizer: | A. Hendy, J. Marcot, P. Holroyd | Enterer: | A. Hendy, J. Marcot, P. Holroyd |
Modifier: | M. Clapham | Research group: | marine invertebrate |
Created: | 2005-07-04 09:28:41 | Last modified: | 2019-08-18 20:03:25 |
Access level: | the public | Released: | 2005-07-04 09:28:41 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
13852. | R. L. Squires. 2001. Additions to the Eocene megafossil fauna of the Llajas Formation, Simi Valley, southern California. Contributions in Science (Natural History Museum of Los Angeles County) 489:1-40 [A. Miller/A. Hendy/A. Hendy] |
Secondary references:
69206 | T. Nyborg, A. Garassino, and G. Slak. 2017. Eonomus californianus n. gen., n. sp. (Crustacea, Brachyura, Cymonomidae) from the Eocene Llajas Formation, California (USA). Neues Jahrbuch für Geologie und Paläontologie-Abhandlungen 286(2):189-193 [P. Holroyd/P. Holroyd] | |
59877 | R. L. Squires. 1984. Megapaleontology of the Eocene Llajas Formation, Simi Valley, California. Contributions in Science, Natural History Museum of Los Angeles County 350:1-76 [M. Clapham/M. Clapham] |