Where: Argentina (37.8° S, 70.4° W: paleocoordinates 36.9° S, 33.5° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Agrio Formation, Late/Upper Valanginian (140.2 - 136.4 Ma)
• approx. 21 m above the base of the formation
• bed-level stratigraphic resolution
Environment/lithology: marine; concretionary, gray, green, calcareous shale and shelly/skeletal, calcareous 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 37760: authorized by John Alroy, entered by Erin Leckey on 23.03.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Olcostephanus (Viluceras) sp. Aguirre-Urreta and Rawson 1999 ammonite |