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. 136 m above the base of the formation

• bed-level stratigraphic resolution

Environment/lithology: marine; concretionary shale and shelly/skeletal, calcareous packstone

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 37737: authorized by John Alroy, entered by Erin Leckey on 22.03.2004

Creative Commons license: CC BY (attribution)