El Durazno 2, Agrio Formation: Late/Upper Valanginian, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Ostreida - Ostreidae
Ostreidae indet. Rafinesque 1815
Bivalvia - Trigoniida - Myophorellidae
Steinmanella transitoria Steinmann 1881
see common names

Geography
Country:Argentina
Coordinates: 37.8° South, 70.4° West (view map)
Paleocoordinates:36.9° South, 33.5° West
Basis of coordinate:based on nearby landmark
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 Local bed:2
Local order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: approx. 8 m above the base of the formation
Lithology and environment
Primary lithology:concretionary silty,calcareous "shale"
Secondary lithology:shelly/skeletal calcareous packstone
Includes fossils?Y
Lithology description: dark (varying shades of grey, black and green) silty shales containing calcareous nodules and interbedded calcareous coquina and at the base, medium-grained sandstones
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:37756
Authorizer:J. Alroy Enterer:E. Leckey
Modifier:E. Leckey Research group:marine invertebrate
Created:2004-03-23 11:00:30 Last modified:2004-03-23 13:00:30
Access level:the public Released:2004-03-23 11:00:30
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]