Arroyo Los Chacays 2, Agrio Formation (Cretaceous of Argentina)

Where: Argentina (37.8° S, 70.2° W: paleocoordinates 36.9° S, 33.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Agrio Formation, Late/Upper Valanginian (140.2 - 136.4 Ma)

• second lowest level at this locality, distance between fossiliferous horizons unknown

• bed-level stratigraphic resolution

Environment/lithology: marine; shale and shelly/skeletal packstone

• specimens in dark shales interbedded with coquina

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 37784: authorized by John Alroy, entered by Erin Leckey on 23.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Ammonitida - Olcostephanidae