Tunnel near smelter at Selby Station: Thanetian, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Cephalopoda
- Nautilida
- Nautilidae
|
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| 1 specimen | |||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | California | County: | Contra Costa |
| Coordinates: | 38.1° North, 122.2° West (view map) | ||||
| Paleocoordinates: | 47.3° North, 91.2° West (Wright 2013) | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Paleocene |
| Stage: | Thanetian | 10 m.y. bin: | Cenozoic 1 |
| Key time interval: | Thanetian | ||
| Age range of interval: | 59.24 - 56 m.y. ago |
Stratigraphy
| Formation: | Vine Hill | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: From the "Martinez", now mapped as Vine Hill Sandstone, lower member. AGE: Paleocene, according to Miller (1947). The upper Vine Hill Sandstone includes the Thanetian Turritella infragranulata Zone of Soul (1983). Bukry et al. (1998) found calcareous nannofossil zones CP5, CP10, and CP11 in the upper Vine Hill Sandstone (latest Selandian-Ypresian). McDougall (2007) assigned the Vine Hill to the Ynezian benthic foraminferal zone, correlated with planktonic zone P4 and nannofossil zones CP5-CP7, of Selandian-Thanetian age. STRATIGRAPHIC POSITION: From unknown position within section, but near the top of the formation, as only the upper part is exposed below the contact with the overlying Las Juntas shale formation (McDougall, 2007). | |||||
Lithology and environment
| Primary lithology: | glauconitic,gray,green lithified sandstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Dickerson (1914) describes the fossiliferous beds at Selby as gray-green glauconitic sandstone. LITHIFICATION: Lithified, on the basis of facies description and specimen preservation. | |
| Environment: | offshore |
| Geology comments: ENVIRONMENT: Not stated. The glauconitic nature of the sandstone suggests shelf environments. Benthic foraminifera reported by McDougall (2007) reflect depths no shallower than middle-outer neritic, but also range in many cases to bathyal or even abyssal depths. However, the foraminifera may be from the upper finer-grained part of the formation, and the sandstones may be somewhat shallower. An offshore environment is tentatively assigned on the basis of the foraminifera, although the location could be offshore-transition. | |
Taphonomy
| Modes of preservation: | cast,mold/impression |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | poor |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | UCMP |
| Collection method comments: COLLECTOR: Unknown collector. REPOSITORY: University of California. | |
| Taxonomic list comments:COVERAGE: Limited to Nautiloida. NOMENCLATURE: Authoritative publication with relatively recent nomenclature and species-resolution identifications. | |
Metadata
| Also known as: | UCMP IP12165 | ||
| Database number: | 81801 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | J. Marcot | Research group: | marine invertebrate |
| Created: | 2008-07-16 05:21:06 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2008-07-16 05:21:06 |
| Creative Commons license: | CC0 | ||
Reference information
Primary reference:
| 27587. | A. K. Miller. 1947. Tertiary nautiloids of the Americas. Geological Society of America Memoir 23:1-234 [A. Hendy/A. Hendy] |
Secondary references:
| 59868 | A. K. Miller and H. R. Downs. 1950. Tertiary nautiloids of the Americas: supplement. Journal of Paleontology 24:1-18 [M. Clapham/M. Clapham] |