CSUN Loc. 444, Las Llajas Canyon: Lutetian, California

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Polychaeta - Sabellida - Serpulidae
Rotularia (Rotularia) tejonensis Arnold 1909
Squires 1984
recombined as Rotularia (Rotularia) tejonense
Scaphopoda - Dentaliida - Dentaliidae
Dentalium stentor Anderson and Hanna 1925
Squires 1984
Cephalopoda - Nautilida - Nautilidae
Kummelonautilus sp. Matsumoto 1984
Squires 2001
Gastropoda - Ampullinidae
Pachycrommium clarki (Stewart 1927)
Squires 1984
Eocernina hannibali (Dickerson 1914)
Squires 1984
Gastropoda - Turritellidae
Turritella andersoni Dickerson 1916
Squires 1984
as Turritella andersoni lawsoni
Turritella uvasana Conrad 1855
Squires 1984
as Turritella uvasana applinae
Gastropoda - Cymatiidae
Olequahia domenginica (Vokes 1939)
Squires 1984
original and current combination Ranella domenginica
Gastropoda - Cassidae
Galeodea (Caliagaleodea) californica Clark 1942
Squires 1984
recombined as Galeodea californica
Phalium (Semicassis) tuberculiformis (Gabb 1864)
Squires 1984
Gastropoda - Ranellidae
Cymatium janetae n. sp. Squires 1983
Gastropoda - Eocypraeidae
Cypraea castacensis Stewart 1927
Squires 1984
recombined as Grovesia castacensis
Gastropoda - Neogastropoda - Fasciolariidae
Clavilithes sp. n. sp. Swainson 1840
Gastropoda - Neogastropoda - Volutidae
Lyrischapa lajollaensis (Hanna 1927)
Squires 1984
Gastropoda - Neogastropoda - Clavatulidae
Fusiturricula (Crenaturricula) crenatospira (Cooper 1894)
Squires 1984
recombined as Crenaturricula crenatospira
as Fusiturricula (Crenaturricula) crenatospira domenginica
Gastropoda - Neogastropoda - Turridae
Surculites mathewsonii (Gabb 1864)
Squires 1984
Gastropoda - Strombidae
Ectinochilus (Macilentos) macilentus (White 1889)
Squires 1984
Gastropoda - Xenophoridae
Xenophora stocki Dickerson 1916
Squires 1984
Gastropoda - Heterostropha - Architectonicidae
Architectonica (Stellaxis) cognata (Gabb 1864)
Squires 1984
Bivalvia - Solenida - Solenidae
Solena (Eosolen) navacularis (Anderson and Hanna 1925)
Squires 1984
recombined as Solena (Eosolen) novacularis
Bivalvia - Pholadida - Teredinidae
? Teredo sp. Linnaeus 1758
Squires 1984
Bivalvia - Cardiida - Cardiidae
Nemocardium linteum (Conrad 1855)
Squires 1984
recombined as Nemocardium (Nemocardium) linteum
Bivalvia - Carditida - Crassatellidae
Crassatella uvasana Conrad 1855
Squires 1984
Bivalvia - Pectinida - Spondylidae
Spondylus carlosensis Anderson 1905
Squires 1984
Bivalvia - Ostreida - Ostreidae
Ostrea idriaensis Gabb 1869
Squires 1984
recombined as Acutostrea idriaensis
Bivalvia - Arcida - Glycymerididae
Glycymeris (Glycymerita) sagittata (Gabb 1864)
Squires 1984
recombined as Glycymerita sagittata
Anthozoa - Scleractinia - Caryophylliidae
? Trochocyathus striatus (Gabb 1864)
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]