Arroyo Los Chacays 3, Agrio Formation: Late/Upper Valanginian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Olcostephanidae
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Olcostephanus (Viluceras) permolestus
(Leanza 1958)
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Bivalvia
- Trigoniida
- Trigoniidae
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Trigonia carinata
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Bivalvia
- Trigoniida
- Myophorellidae
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Steinmanella transitoria
Steinmann 1881
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Bivalvia
- Carditida
- Crassatellidae
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Ptychomya koeneni
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Bivalvia
- Ostreida
- Pinnidae
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Pinna sp.
Linnaeus 1758
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| see common names | |||||||
Geography
| Country: | Argentina |
| Coordinates: | 37.8° South, 70.2° West (view map) |
| Paleocoordinates: | 36.9° South, 33.2° West |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early/Lower Cretaceous |
| Stage: | Valanginian | 10 m.y. bin: | Cretaceous 1 |
| Key time interval: | Late/Upper Valanginian | ||
| Age range of interval: | 139.80000 - 132.60000 m.y. ago |
Stratigraphy
| Formation: | Agrio | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: lowest level at this locality, distance between fossiliferous horizons unknown | |||||
Lithology and environment
| Primary lithology: | calcareous "shale" |
| Secondary lithology: | shelly/skeletal packstone |
| Includes fossils? | Y |
| Lithology description: dark shales with interbedded coquina | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 37785 | ||
| Authorizer: | J. Alroy | Enterer: | E. Leckey |
| Modifier: | E. Leckey | Research group: | marine invertebrate |
| Created: | 2004-03-23 14:11:38 | Last modified: | 2004-03-23 16:11:38 |
| Access level: | the public | Released: | 2004-03-23 14:11:38 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 10016. | M. B. Aguirre-Urreta and P. F. Rawson. 1999. Lower Cretaceous ammonites from the Neuquen Basin, Argentina: Viluceras, a new Valanginian subgenus of Olcostephanus. Cretaceous Research 20:343-357 [J. Alroy/E. Leckey/M. Clapham] |