La Angostura, Río Chico (MLP) (Cretaceous to of Argentina)

Also known as Argyrosaurus type, Pampa Pelada

Where: Chubut, Argentina (45.5° S, 69.2° W: paleocoordinates 48.0° S, 55.9° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Lago Colhué Huapi Formation (Chubut Group), Campanian to Campanian (83.6 - 66.0 Ma)

• supposedly 100 m below the "Notostylops beds"; sometimes listed as Castillo Fm.

•Probably upper member of the Bajo Barreal Formation, Chubut Group (Bonaparte and Gasparini, 1979); Campanian–?Maastrichtian (Late Cretaceous) (Casal et al., 2007). Based on outcrops in the western part of the San Jorge Basin, the Bajo Barreal Formation is generally considered middle Cenomanian–Turonian in age (Bridge et al., 2000; Lamanna et al., 2002); however, recent evidence indicates that the more easterly exposures in the less well-studied Rio Chico area are much younger, i.e., Campanian–?Maastrichtian (Casal et al., 2007) (Mannion and Otero, 2012).

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collected by C. Ameghino in 1889; reposited in the MLP

Collection methods: quarrying, surface (in situ), mechanical,

• This is probably the same area prospected by the FMNH but no collections were made; they found evidence of prior work, including tools from Sheffield, England and ordered piles of dinosaur bones. The forelimb of Argyrosaurus seems to have come from a fairly complete skeleton that was not entirely excavated.

Primary reference: F. Ameghino. 1889. Contribución al conocimiento de los mamíferos fósiles de la República Argentina [Contribution to the knowledge of the fossil mammals of the Argentine Republic]. Actas de la Academia Nacional de Ciencias de la República Argentina en Córdoba 6:xxxii-1027 [M. Uhen/M. Uhen/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 51618: authorized by Matthew Carrano, entered by Matthew Carrano on 09.06.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

 Saurischia -
Argyrosaurus superbus n. gen. n. sp.
Argyrosaurus superbus n. gen. n. sp. Lydekker 1893 sauropod