Also known as Bajo Palangana; Ernestokokenia fauna

Where: Chubut, Argentina (45.4° S, 67.2° W: paleocoordinates 48.0° S, 56.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Riochican mammal zone, Las Flores Formation (Río Chico Group), Riochican (57.0 - 55.8 Ma)

• 85 to 88 meters above the "Banco Negro Superior" and about six meters below the Casamayor tuffs; Ernestokokenia Faunal Zone of Simpson (1935), and Riochican SALMA, which is argued to be late Early Eocene in age (Woodburne et al. 2014). Although this has been assigned to the Koluel Kaike Formation by some studies, Vera and Krause (2020) argue that this level in the locality belongs to the upper Las Flores Formation

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; coarse-grained, gray sandstone

Size classes: macrofossils, mesofossils

Collected by Simpson, Brandmayr in 1931, 1934; reposited in the AMNH

• Original specimens are in the Feruglio Collection. Casts in AMNH

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 13781: authorized by John Alroy, entered by Jill Wertheim on 25.04.2002, edited by Richard Butler, Jelle Zijlstra, Evangelos Vlachos and Philip Mannion

Creative Commons license: CC BY (attribution)