Where: Chubut, Argentina (42.7° S, 70.0° W: paleocoordinates 44.9° S, 58.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Lefipán Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

Environment/lithology: marine; lithology not reported

Size class: macrofossils

• MLP 40-XI-14-6, part of a cranium attached to the mandible, atlas-axis complex, anterior and middle cervical vertebrae, anterior caudal vertebrae and one posterior caudal vertebrae, caudal ribs and an incomplete limb.

Primary reference: Z. Gasparini, N. Bardet, J. E. Martin and M. Fernandez. 2003. The elasmosaurid plesiosaur Aristonectes Cabrera from the latest Cretaceous of South America and Antarctica. Journal of Vertebrate Paleontology 23(1):104-115 [M. Carrano/H. Street]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 97872: authorized by Matthew Carrano, entered by Hallie Street on 03.09.2010

Creative Commons license: CC BY (attribution)