Point Reyes: Tortonian, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Mammalia
- Carnivora
- Odobenidae
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cf. Dusignathus sp.
Kellogg 1927
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Mammalia
- Cetacea
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Scaldicetus cf. grandis
(Du Bus 1872)
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Mammalia
- Cetacea
- Monodontidae
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Delphinapterinae indet.
Gill 1871
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Mammalia
- Cetacea
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aff. Argyrocetus sp.
Lydekker 1894
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| This id seems unlikely given the early Pliocene age of the collection (MDU). | ||||||||||
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Balaenopteroidea indet.
Gray 1868
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Pyenson and Brudvik 2007 | |||||||||
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Mammalia
- Cetacea
- Balaenidae
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cf. Balaenula sp.
Van Beneden 1872
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Mammalia
- Sirenia
- Dugongidae
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Dusisiren informal sp. D
Domning 1978
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= Dusisiren dewana
Takahashi et al. 1986
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Domning and Furusawa 1995 | |||||||||
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Actinopteri
- Salmoniformes
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Smilodonichthys sp.
Cavender and Miller 1972
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Acipenseriformes
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Acipenseriformes indet.
Berg 1940
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Chondrichthyes
- Lamniformes
- Lamnidae
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Isurus hastalis
(Agassiz 1838)
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| recombined as Carcharodon hastalis | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | California | County: | Marin |
| Coordinates: | 38.0° North, 123.0° West (view map) | ||||
| Paleocoordinates: | 37.5° North, 120.2° West | ||||
| Basis of coordinate: | estimated from map |
Time
| Period: | Neogene | Epoch: | Miocene |
| Stage: | Tortonian | 10 m.y. bin: | Cenozoic 6 |
| Key time interval: | Tortonian | ||
| Age range of interval: | 11.63000 - 7.24600 m.y. ago | ||
| Age estimate: | 9.3 ± .5 Ma (K-Ar) |
Stratigraphy
| Formation: | Drakes Bay | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Domning (1977) states that this collection is early Pliocene, despite a K/Ar date of 9.3, which is clearly Tortonian (Galloway, 1977) | |||||
Lithology and environment
| Primary lithology: | glauconitic sandstone |
| Includes fossils? | Y |
| Lithology description: glauconitic sand | |
| Environment: | shallow subtidal indet. |
| Geology comments: gradual transgression, strong currents, wave-dominated | |
Taphonomy
| Modes of preservation: | body,soft parts,original phosphate |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | UCMP |
Metadata
| Also known as: | UCMP V6931, UCMP V6930 | ||
| Database number: | 52216 | ||
| Authorizer: | M. Uhen | Enterer: | M. Uhen |
| Modifier: | M. Uhen | Research group: | vertebrate |
| Created: | 2005-08-01 10:19:32 | Last modified: | 2019-01-31 13:25:21 |
| Access level: | the public | Released: | 2005-08-01 10:19:32 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 6029. | 5% 34240 | D. P. Domning. 1978. Sirenian evolution in the North Pacific Ocean. University of California Publications in Geological Sciences 118:1-176 [M. Uhen/M. Uhen/M. Uhen] |
Secondary references:
| 18605 | D. P. Domning and H. Furusawa. 1995. Summary of taxa and distribution of Sirenia in the North Pacific Ocean. The Island Arc 3:506-512 [M. Uhen/M. Uhen] | |
| 43714 | A. J. Galloway. 1977. Geology of the Point Reyes Penninsula, Marine County, California. California Division of Mines and Geology Bulletin 202:1-72 [M. Uhen/M. Uhen] | |
| 25328 | N. Pyenson and K. Brudvik. 2007. Rare fossil baleen from the Purisima Formation of California: Implications for soft tissue preservation in shallow marine environments. Journal of Vertebrate Paleontology 27(3):132A [M. Uhen/M. Uhen] |