Where: Argentina (39.0° S, 68.0° W: paleocoordinates 38.0° S, 31.2° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Agrio Formation, Valanginian (139.8 - 132.9 Ma)
• approx. 25 m above the base of the formation
• bed-level stratigraphic resolution
Environment/lithology: marine; concretionary shale and shelly/skeletal, sandy packstone
Size class: macrofossils
Preservation: concretion
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 37725: authorized by John Alroy, entered by Erin Leckey on 22.03.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
"Olcostephanus (Olcostephanus) atherstoni" = Olcostephanus atherstoni
"Olcostephanus (Olcostephanus) atherstoni" = Olcostephanus atherstoni Sharpe 1856 ammonite |