Negritos [Negritos Fm]: Early/Lower Eocene, Peru
collected by Olsson
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Gastropoda
- Rostellariidae
|
||||||||||
|
Calyptraphorus (Aulacodiscus) lissoni
(Douvillé 1921)
|
||||||||||
| recombined as Calyptraphorus lissoni | ||||||||||
|
Bivalvia
- Mytilida
- Mytilidae
|
||||||||||
|
Mytilus euglyphus
Woods 1922
|
||||||||||
| recombined as Brachidontes (Hormomya) euglyphus | ||||||||||
| SUBSPECIES: Mytilus euglyphus negritensis | ||||||||||
|
Bivalvia
- Ostreida
- Ostreidae
|
||||||||||
|
Ostrea negritensis n. sp.
Olsson 1928
|
||||||||||
|
Bivalvia
- Carditida
- Carditidae
|
||||||||||
|
Venericardia planicosta
Lamarck 1801
|
||||||||||
| SUBSPECIES: Venericardia planicosata negritensis | ||||||||||
|
= Venericardia (Venericor) negritensis
Olsson 1928
|
Gardner and Bowles 1939 | |||||||||
|
Bivalvia
- Cardiida
- Veneridae
|
||||||||||
|
Pitaria (Tivela) siliqua n. sp.
Olsson 1928
|
||||||||||
| recombined as Tivelina siliqua | ||||||||||
|
Pitaria (Lamelliconcha) parinensis n. sp.
Olsson 1928
|
||||||||||
| recombined as Lamelliconcha parinensis | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Peru | State/province: | Piura |
| Coordinates: | 4.7° South, 81.3° West (view map) | ||
| Paleocoordinates: | 15.0° South, 112.0° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Ypresian | 10 m.y. bin: | Cenozoic 2 |
| Key time interval: | Early/Lower Eocene | ||
| Age range of interval: | 56.00000 - 47.80000 m.y. ago |
Stratigraphy
| Formation: | Negritos | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: LITHOSTRATIGRAPHY: From the Negritos Fm, which is regionally overlain by the Salina Gp (Middle Eocene). AGE: Regarded as Early Eocene (p. 9), on the basis of molluscan biostratigraphy. STRATIGRAPHIC POSITION: From unknown position within formation.
| |||||
Lithology and environment
| Primary lithology: | glauconitic,pebbly poorly lithified conglomeratic sandstone |
| Includes fossils? | Y |
| Lithology description: LITHOLOGY: Interbedded impure sandstones, pebble beds, shales and impure glauconite. LITHIFICATION: Poorly lithified, on the basis of figured specimens. | |
| Environment: | coastal indet. |
| Geology comments: ENVIRONMENT: Shelfal siliciclastic environment. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | PRI |
| Collectors: | Olsson |
| Collection method comments: COLLECTOR: Not stated, but presumably A. Olsson. REPOSITORY: Not stated, but presumably PRI | |
| Taxonomic list comments:COVERAGE: Exhaustive for bivalves, gastropods, and brachiopods. NOMENCLATURE: Authoritative publication, but with somewhat antiquated nomenclature. | |
Metadata
| Database number: | 88360 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Subset of collection #: | 86944 | ||
| Created: | 2009-04-09 11:22:47 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2009-04-09 11:22:47 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 17609. | A. A. Olsson. 1928. Contributions to the Tertiary paleontology of northern Peru: Part 1. Bulletins of American Paleontology 14(52) [A. Miller/A. Hendy] |
Secondary references:
| 36277 | J. Gardner and E. Bowles. 1939. The Venericardia planicosta group in the Gulf Province. United States Geological Survey Professional Paper 189(F):143-215 [A. Hendy/A. Hendy] |