Saucito Rancho: Tortonian, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Mammalia
- Cetacea
- Balaenopteridae
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Balaenoptera ryani n. sp.
Hanna and McLellan 1924
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| CAS 1733 | ||||||||||
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= "Balaenoptera" ryani
Hanna and McLellan 1924
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Barnes 1977 | |||||||||
| invalid subgroup of Balaenoptera | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | California |
| Coordinates: | 36.6° North, 121.9° West (view map) | ||
| Paleocoordinates: | 36.1° North, 119.1° West | ||
| Basis of coordinate: | based on political unit |
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: | 11.6 to 9.5 Ma (other) |
Stratigraphy
| Formation: | Monterey | Member: | Canyon del Rey Diatomite | ||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: early late Miocene according to Demere et al. 2005
The original description states that the “top stratum” of the section in which the specimen was found “is loose and scarcely consolidated, characters which accompany the upper part of the Monterey shale member whenever definitely exposed” [67: 238]. Barron [68] placed a rock sample (CAS 866) from the type locality, collected at the same time as the CAS 1733, into the Canyon del Rey Diatomite Member. Fission-track dating of associated ash layers place the base of this unit at 11.3 ± 0.9 Ma [69]. A second ash horizon from within the Canyon del Rey Diatomite Member has been dated to 8.4 ± 0.8 Ma, but it is unclear whether the holotype was retrieved from above or below this horizon The rock sample (CAS 866) apparently associated with the holotype has yielded the diatom Denticulopsis lauta [68], which last appears around 9–10 Ma [70, 71]. Together, these observations imply an early Tortonian (11.6–9.5 Ma) age for B. ryani. (Marx & Forcye, 2015) | |||||
Lithology and environment
| Primary lithology: | condensed,diatomaceous lithified "shale" |
| Includes fossils? | Y |
| Lithology description: "The strata of the exposure dip to the westward at an angle of about 45 degrees, and the strike is northeast. The buildings [whose foundation is the locality of the specimen] are erectedat the base of a steep incline on the west side of a creek, the slope being composed of diatomaceous earth. The top stratum is loose and scarcely consolidated, characters which accompany the upper part of the Monterey shale member wherever definitely exposed. Below this loose, purer grade of material, there is exposed about 75 feet of thinly bedded, more consolidated earth with occasionally some "opalized" or "flinty" shale | |
| Environment: | basinal (siliciclastic) |
| Geology comments: deep Pacific basin | |
Taphonomy
| Modes of preservation: | body,original phosphate |
| Size of fossils: | macrofossils |
| Associated major elements: | some |
| Disassociated major elements: | none |
| Disassociated minor elements: | none |
Collection methods and comments
| Collection methods: | salvage,observed (not collected) |
| Collection size: | 1 individuals |
| Reason for describing collection: | taphonomic analysis |
| Museum repositories: | CAS |
Metadata
| Database number: | 45501 | ||
| Authorizer: | M. Uhen | Enterer: | N. Pyenson, M. Uhen |
| Modifier: | B. Shipps | Research group: | vertebrate |
| Created: | 2004-10-26 08:36:58 | Last modified: | 2017-02-26 15:47:21 |
| Access level: | the public | Released: | 2004-10-26 08:36:58 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 11914. | G. D. Hanna and M. McLellan. 1924. A new species of whale from the type locality of the Monterey Group. Proceedings of the California Academy of Sciences 13(14):237-241 [M. Uhen/N. Pyenson/N. Pyenson] |
Secondary references:
| 12297 | L. G. Barnes. 1977. Outline of eastern North Pacific fossil cetacean assemblages. Systematic Zoology 25(4):321-343 [M. Uhen/M. Uhen/M. Uhen] | |
| 15521 | T. A. Deméré, A. Berta, and M. R. McGowen. 2005. The taxonomic and evolutionary history of modern balaenopteroid mysticetes. Journal of Mammalian Evolution 12(1/2):99-143 [M. Uhen/M. Uhen/M. Uhen] | |
| 55050 | F. G. Marx and R. E. Fordyce. 2015. Baleen boom and bust: a synthesis of mysticete phylogeny, diversity and disparity. Royal Society Open Science 2:140434 [M. Uhen/M. Uhen] |