Lomitos Cgl, Talara Fm - N of Great Fault, Negritos: Bartonian, Peru
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Neogastropoda
- Volutidae
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| see common names | |||||||
Geography
| Country: | Peru | State/province: | Piura |
| Coordinates: | 4.7° South, 81.3° West (view map) | ||
| Paleocoordinates: | 4.5° South, 69.2° West (Wright 2013) | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Bartonian | 10 m.y. bin: | Cenozoic 3 |
| Key time interval: | Bartonian | ||
| Age range of interval: | 41.03 - 37.71 m.y. ago |
Stratigraphy
| Formation: | Talara | Member: | Talara Shale | ||
| Local section: | Negritos | Local bed: | Lomitas conglomerate | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Regarded as lower Upper Eocene on the basis of faunal similarity. Foraminifera suggest an upper Eocene age. Olsson states that the Talara and Saman rocks can be referred to the Upper Eocene and in terms of the European section, to the Bartonian and Ludian.....respectively? In most places the Talara Formation can be divided into three members, a lower shale (Talara Shale), a middle sandstone (Talara Sandstone), and an upper shale (Pozo Shale). In a complete section the Talara Formation has an average thickness of about 2800 ft. The collection is derived from a sandy basal layer known as the Lomitos Conglomerate in the Talara Shale member, which can reach a thickness of 400 ft or more. From a zone of coarse, black, quartzitic cobbles in arenaceous shales, resting upon eroded Restin shales. | |||||
Lithology and environment
| Primary lithology: | coarse,pebbly,black poorly lithified sandy "shale" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: Coarse, black, quartzitic cobbles in arenaceous shales | |
| Environment: | coastal indet. |
| Geology comments: Appears to be shelfal siliciclastic environment judging from faunal composition. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | selective quarrying,field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: No museum repositories are reported, but material may presumably be the AMNH of PRI collections. Because of uncertaintly this field is left ommited. | |
| Taxonomic list comments:Exhaustive for Mollusca. | |
Metadata
| Database number: | 52529 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | J. Alroy | Research group: | marine invertebrate |
| Created: | 2005-08-10 12:23:52 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2005-08-10 12:23:52 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 14126. | A. A. Olsson. 1930. Contributions to the Tertiary Paleontology of Northern Peru: Part 3, Eocene Mollusca. Bulletins of American Paleontology 17(62):1-164 [A. Miller/A. Hendy/A. Hendy] |