Cerro Bayo, NW flank (Cretaceous of Argentina)

Where: Neuquen, Argentina (38.7° S, 70.1° W: paleocoordinates 38.2° S, 33.8° W)

• coordinate stated in text

When: Agua de la Mula Member (Agrio Formation), Late/Upper Hauterivian (136.4 - 130.0 Ma)

• A partial section of the Agrio Formation is well exposed. The Avilé Member is not developed as a distinctive unit here.

Environment/lithology: marine; gypsiferous, gray, silty shale

Size class: macrofossils

Preservation: mold/impression

Primary reference: P. F. Rawson and M. B. Aguirre-Urreta. 2012. Lower Cretaceous ammonites from the Neuquén Basin, Argentina: The Hauterivian genus Spitidiscus. Cretaceous Research 33:97-105 [J. Alroy/J. Martinelli]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 135520: authorized by John Alroy, entered by Julieta Martinelli on 27.10.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ammonitida - Holcodiscidae
Spitidiscus riccardii Leanza and Wiedmann 1992 ammonite