Where: Chubut, Argentina (44.7° S, 68.4° W: paleocoordinates 45.9° S, 61.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Sarmiento Formation, Deseadan (29.0 - 21.0 Ma)

• The lava flow, Beta, overlies the Crater Lake Beds, and it is overlain by a nodular tuff.

•

•Eocene–Oligocene ‘Tobas del Sarmiento’, Sarmiento Group or Sarmiento Formation (Feruglio 1949; Andreis et al. 1975; Spalletti & Mazzoni 1977, 1979; Reguero & Escribano 1996). Regarding the age of Sarmiento formation, absolute dates are lacking for Cabeza Blanca, but Deseadan levels have been dated in other localities such as Salla, Bolivia (29.4–25.65 Ma), Moquegua, Peru (26.25 Ma), and Chubut, Argentina, Gran Barranca (29.4–24.2 Ma) and Scarritt Pocket (27.17 Ma) (Dunn et al. 2013 and references therein; Vucetich et al. 2014).

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Primary reference: R.G. Chaffee. 1952. The Deseadan vertebrate fauna of the Scarritt Pocket, Patagonia. Bulletin of the American Museum of Natural History 98:505-562 [J. Alroy/J. Wertheim/J. Wertheim]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 49851: authorized by John Alroy, entered by Jill Wertheim on 28.04.2005, edited by Jelle Zijlstra

Creative Commons license: CC BY (attribution)