Chireno road, south of San Augustine-Nacogdoches highway: Lutetian, Texas
collected 1941
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Cephalopoda
- Nautilida
- Aturiidae
|
||||||||||
| (1 measurement) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Texas | County: | Nacogdoches |
| Coordinates: | 31.5° North, 94.4° West (view map) | ||||
| Paleocoordinates: | 36.4° North, 74.8° West (Wright 2013) | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Lutetian | 10 m.y. bin: | Cenozoic 2 |
| Key time interval: | Lutetian | ||
| Age range of interval: | 48.07 - 41.03 m.y. ago |
Stratigraphy
Lithology and environment
| Primary lithology: | glauconitic poorly lithified muddy sandstone |
| Environment: | shoreface |
| Geology comments: Choung, 1975: Should the bathymetry be inferred strictly on the basis of [foraminiferal] species diversity and dominance, the average Weches environment has never been deeper than 10 fathoms. (This is approximately the maximum depth (20 +/- m) of the inner neritic zone as defined in the present study.) The relative percentage of planktonic species also suggests that the Weches Formation was mostly under inner neritic conditions (planktonic/ total population ratio = less than 5%) except in the middle portion of the section, where, for a brief period of time, up to 13% of the planktonic population observed indicates a period of middle neritic deposition (at least on the basis of planktonic foraminifers).
Ramos & Galloway: Weches Formation consists of shelf sands and muds that overlie a transgressive ravinement surface eroded into underlying coastal/deltaic facies. Appears to represent lower part of shoreface or possibly upper part of offshore transition. | |
Taphonomy
| Modes of preservation: | mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | USNM | Collection dates: | 1941 |
Metadata
| Database number: | 180410 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2016-07-16 09:26:34 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2016-07-16 09:26:34 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 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] |