Rio Mayer Fm (38 m thick bed, lower part) - Puesto Bajo Comision (Cretaceous of Argentina)

Where: Argentina (48.9° S, 72.1° W: paleocoordinates 50.7° S, 39.2° W)

• outcrop-level geographic resolution

When: Hypacanthoplites jacobi ammonoid zone, Rio Mayer Formation, Late/Upper Aptian (122.5 - 113.0 Ma)

• STRATIGRAPHIC RELATIONS: Middle Rio Mayer Fm, underlying Kachaike Fm (Early Albian?). AGE: Aptian on occurrence of A. hallei=A. nolani European zone) STRATIGRAPHIC POSITION: Lower fossiliferous horizon within 38 m of Rio Mayer Fm, underlying 20 m thick sill and overlying 1 m thick shale.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, shelly/skeletal, black shale

• ENVIRONMENT: No environmental data reported in text.
• SPECIFIC LITHOLOGY: Black shales with fossiliferous horizon. LITHIFICATION: Lithified, assumed on the basis of age and figured specimens.

Size class: macrofossils

Reposited in the MLP

• COLLECTOR: Collected by H. Arbe (1981). REPOSITORY: MLP (Museo de la Plata, Argentina).

Primary reference: F. A. Medina and A.C. Riccardi. 2005. Desmoceratidae, Silesitidae and Kossmaticeratidae (Ammonitida) from the Upper Aptian-Albian of Patagonia (Argentina). Revue de Paleobiologie, Geneve 24(1):251-286 [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 63986: authorized by Austin Hendy, entered by Austin Hendy on 29.08.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• IDENTIFIER: F.A. Medina and A.C. Riccardi. NOMENCLATURE: Authoritative publication, using modern nomenclature, with species-level assignments. COMPLETENESS: Limited to Ammonitida. Other groups not mentioned in text.
Show authors, comments, and common names
Cephalopoda
 Ammonitida - Aegocrioceratidae
Peltocrioceras deeckei
Peltocrioceras deeckei Favre 1908 ammonite
 Ammonitida - Ancyloceratidae
Australiceras (Australiceras) hallei
 Ammonitida - Oppeliidae
Sanmartinoceras africanum, Sanmartinoceras walshense
Sanmartinoceras africanum ammonite
Subspecies: S. africanum cf. africanum
Sanmartinoceras walshense Etheridge 1892 ammonite
Malacostraca
 Decapoda - Erymidae
Enoploclytia sp.
Enoploclytia sp. M'Coy 1849 decapod