Where: Argentina (39.5° S, 67.7° W: paleocoordinates 38.5° S, 30.9° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Agrio Formation, Valanginian (139.8 - 132.9 Ma)
• 1.4 m thick bed, 1.3 m above base of sequence
• bed-level stratigraphic resolution
Environment/lithology: marine; concretionary, silty, calcareous shale and sandy limestone
Size class: macrofossils
Primary reference: 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]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 37753: authorized by John Alroy, entered by Erin Leckey on 23.03.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Olcostephanus (Viluceras) duraznoensis Aguirre-Urreta and Rawson 1999 ammonite |