CSUN Loc. 471a - Chivo Canyon [Llajas Fm]: Ypresian, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Chondrichthyes
- Myliobatiformes
- Myliobatidae
|
||||||||||
|
? Myliobatis sp.
Cuvier 1816
|
||||||||||
|
Gastropoda
- Turritellidae
|
||||||||||
|
Turritella andersoni
Dickerson 1916
|
Squires 1984 | |||||||||
| as Turritella andersoni lawsoni | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | California | County: | Ventura |
| Coordinates: | 34.3° North, 118.7° West (view map) | ||||
| Paleocoordinates: | 36.8° North, 101.7° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Altitude: | 502 meters | ||||
| Geographic resolution: | small collection |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Ypresian | 10 m.y. bin: | Cenozoic 2 |
| Key time interval: | Ypresian | ||
| Age range of interval: | 56.00000 - 47.80000 m.y. ago |
Stratigraphy
| Formation: | Llajas | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: From lower Llajas Formation, lower "Domengine" stage, base of CP12a calcareous nannoplankton zone, upper Ypresian stage, Lower Eocene, C22n chron. | |||||
Lithology and environment
| Primary lithology: | planar lamination,bioturbation sandstone |
| Secondary lithology: | argillaceous siltstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: Alternating laminated and bioturbated sandstones grading into muddy siltstone. | |
| Environment: | offshore |
| Glacial or sequence phase: | transgressive |
| Geology comments: Listed as "shallow marine transgressive" - as from top of unit, which appears to be transgressive, and immediatelty below the apparent "maximum flooding/starvation zone", the offshore environment is chosen for this collection, rather than shallow water indet. | |
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) | |
| 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: | 51930 | ||
| Authorizer: | A. Hendy, J. Marcot | Enterer: | A. Hendy, J. Marcot |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2005-07-04 14:18:56 | Last modified: | 2016-02-29 00:55:07 |
| Access level: | the public | Released: | 2005-07-04 14:18:56 |
| 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:
| 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] |