CSUN Loc. 444, Las Llajas Canyon: Lutetian, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Polychaeta
- Sabellida
- Serpulidae
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Rotularia (Rotularia) tejonensis
Arnold 1909
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Squires 1984 | |||||||||
recombined as Rotularia (Rotularia) tejonense | ||||||||||
Scaphopoda
- Dentaliida
- Dentaliidae
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Dentalium stentor
Anderson and Hanna 1925
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Squires 1984 | |||||||||
Cephalopoda
- Nautilida
- Nautilidae
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Kummelonautilus sp.
Matsumoto 1984
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Squires 2001 | |||||||||
Gastropoda
- Ampullinidae
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Pachycrommium clarki
(Stewart 1927)
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Squires 1984 | |||||||||
Eocernina hannibali
(Dickerson 1914)
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Squires 1984 | |||||||||
Gastropoda
- Turritellidae
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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
- Cymatiidae
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Olequahia domenginica
(Vokes 1939)
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Squires 1984 | |||||||||
original and current combination Ranella domenginica | ||||||||||
Gastropoda
- Cassidae
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Galeodea (Caliagaleodea) californica
Clark 1942
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Squires 1984 | |||||||||
recombined as Galeodea californica | ||||||||||
Phalium (Semicassis) tuberculiformis
(Gabb 1864)
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Squires 1984 | |||||||||
Gastropoda
- Ranellidae
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Cymatium janetae n. sp.
Squires 1983
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Gastropoda
- Eocypraeidae
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Cypraea castacensis
Stewart 1927
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Squires 1984 | |||||||||
recombined as Grovesia castacensis | ||||||||||
Gastropoda
- Neogastropoda
- Fasciolariidae
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Clavilithes sp. n. sp.
Swainson 1840
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Gastropoda
- Neogastropoda
- Volutidae
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Lyrischapa lajollaensis
(Hanna 1927)
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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 | ||||||||||
Gastropoda
- Neogastropoda
- Turridae
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Surculites mathewsonii
(Gabb 1864)
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Squires 1984 | |||||||||
Gastropoda
- Strombidae
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Ectinochilus (Macilentos) macilentus
(White 1889)
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Squires 1984 | |||||||||
Gastropoda
- Xenophoridae
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Xenophora stocki
Dickerson 1916
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Squires 1984 | |||||||||
Gastropoda
- Heterostropha
- Architectonicidae
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Architectonica (Stellaxis) cognata
(Gabb 1864)
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Squires 1984 | |||||||||
Bivalvia
- Solenida
- Solenidae
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Solena (Eosolen) navacularis
(Anderson and Hanna 1925)
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Squires 1984 | |||||||||
recombined as Solena (Eosolen) novacularis | ||||||||||
Bivalvia
- Pholadida
- Teredinidae
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? Teredo sp.
Linnaeus 1758
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Squires 1984 | |||||||||
Bivalvia
- Cardiida
- Cardiidae
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Nemocardium linteum
(Conrad 1855)
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Squires 1984 | |||||||||
recombined as Nemocardium (Nemocardium) linteum | ||||||||||
Bivalvia
- Carditida
- Crassatellidae
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Crassatella uvasana
Conrad 1855
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Squires 1984 | |||||||||
Bivalvia
- Pectinida
- Spondylidae
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Spondylus carlosensis
Anderson 1905
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Squires 1984 | |||||||||
Bivalvia
- Ostreida
- Ostreidae
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Ostrea idriaensis
Gabb 1869
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Squires 1984 | |||||||||
recombined as Acutostrea idriaensis | ||||||||||
Bivalvia
- Arcida
- Glycymerididae
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Glycymeris (Glycymerita) sagittata
(Gabb 1864)
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Squires 1984 | |||||||||
recombined as Glycymerita sagittata | ||||||||||
Anthozoa
- Scleractinia
- Caryophylliidae
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? Trochocyathus striatus
(Gabb 1864)
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Squires 1984 | |||||||||
see common names |
Geography
Country: | United States | State/province: | California | County: | Ventura |
Coordinates: | 34.3° North, 118.7° West (view map) | ||||
Paleocoordinates: | 35.1° North, 104.6° West | ||||
Geographic resolution: | small collection |
Time
Period: | Paleogene | Epoch: | Eocene |
Stage: | Lutetian | 10 m.y. bin: | Cenozoic 2 |
*Period: | Early/Lower Tertiary - Middle Tertiary | *Epoch: | Early/Lower Eocene - Middle Eocene |
*International age/stage: | Middle Lutetian - Early/Lower Ypresian | *Local age/stage: | Domengine - Domengine |
Key time interval: | Lutetian | ||
Age range of interval: | 47.80000 - 41.20000 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Formation: | Llajas | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: The stewart bed is a 1 m thick sandstone unit in the middle of the LLajas formation. Lutetian, chron 21r according to Squires (2001). |
Lithology and environment
Primary lithology: | bioturbation sandstone |
Includes fossils? | Y |
Lithology description: sandstone. | |
Environment: | transition zone/lower shoreface |
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 |
Size of fossils: | macrofossils |
Collection methods and comments
Collection excludes: | all microfossils,some macrofossils |
Collection methods: | bulk,field collection |
Reason for describing collection: | taxonomic analysis |
Museum repositories: | LACM |
Collection method comments: Repository: Formerly California State University Northridge (CSUN) |
Metadata
Database number: | 8013 | ||
Authorizer: | L. Ivany, J. Marcot, A. Hendy | Enterer: | E. Kowalski, J. Marcot, A. Hendy |
Modifier: | M. Clapham | Research group: | marine invertebrate |
Created: | 2000-06-12 07:05:01 | Last modified: | 2019-08-18 20:01:53 |
Access level: | the public | Released: | 2000-06-12 07:05:01 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
519. | R. L. Squires. 1983. New Mollusks from the Lower Middle Eocene Llajas Formation, Southern California. Journal of Paleontology 57(2):354-362 [L. Ivany/E. Kowalski/J. Marcot] |
Secondary references:
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] | |
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] |