Trapalcó, locality A (Cretaceous of Argentina)

Where: Río Negro, Argentina (39.8° S, 66.7° W: paleocoordinates 42.2° S, 54.7° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Jagüel Formation (Malargüe Group), Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• 1.5 m below the Cretaceous/Paleogene boundary

• bed-level stratigraphic resolution

Environment/lithology: marine; green mudstone

• middle platform level
• Laminated, olive green mudstone

Size class: macrofossils

Collected by Hector Cabaza and Museo Municipal de Lamarque in 1998-2001

• MML, Museo Municipal de Lamarque, Rio Negro, Argentina

Primary reference: Z. Gasparini, L. Salgado, and S. Casadio. 2003. Maastrichtian plesiosaurs from northern Patagonia. Cretaceous Research 240:157-170 [P. Mannion/P. Mannion/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 140997: authorized by Philip Mannion, entered by Philip Mannion on 20.03.2013, edited by Jonathan Tennant

Creative Commons license: CC BY (attribution)

Taxonomic list

 Sauropterygia -
Plesiosauria indet. de Blainville 1835 plesiosaur
One caudal vertebrae, MML-Pv 191, and sharp, striated teeth
 Sauropterygia - Elasmosauridae
Elasmosauridae indet. Cope 1869 elasmosaur
MML-PV 3 (right mandibular fragment, prefrontal, four incomplete cervical vertebrae (one anterior, one medial and two posterior), two incomplete dorsal, one sacral and four caudal vertebrae; right femur, ten phalanges of a single (?) paddle, one indeterminate tarsal, rib fragments, several gastroliths)