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Barranca south of Lago Colhue-Huapi, Gran Barranca (Eocene of Argentina)

Where: Chubut, Argentina (45.7° S, 68.7° W: paleocoordinates 48.1° S, 58.9° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Barrancan mammal zone, Sarmiento Formation, Middle Eocene (48.6 - 37.2 Ma)

• Lowest fossil horizon, Casamayor Formation - now referred to as Sarmiento Formation

•Initially referred to the Casamayoran SALMA, which was later subdivided. Now considered type sequence for Barrancan SALMA (see Woodburne et al. 2014)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; claystone

• Bentonite and tuffs

Size classes: macrofossils, mesofossils

Collected by C. Ameghino, C. S. Williams, H. Herrera, W. Stein, Scarritt Expedition, G. F. Sternberg, L. G. Marshall, O. Gutierrez; reposited in the AMNH, FMNH

Primary reference: G. G. Simpson. 1935. Descriptions of the oldest known South American mammals, from the Rio Chico Formation. American Museum Novitates 793:1-25 [J. Alroy/J. Wertheim/J. Wertheim] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 13779: authorized by John Alroy, entered by Jill Wertheim on 25.04.2002, edited by Richard Butler, Jelle Zijlstra, Terri Cleary and Matthew Carrano

Creative Commons license: CC BY (attribution)