Upper Beds - west side of Scarritt Pocket ( of Argentina)

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)

Taxonomic list

Mammalia
 Astrapotheria - Astrapotheriidae
Astrapotheriinae indet. Soria and Alvarenga 1989 placental
 Notoungulata - Interatheriidae
Interatheriinae indet., "Argyrohyrax proavunculus" = Argyrohyrax proavus
Interatheriinae indet. Simpson 1945 notoungulate
"Argyrohyrax proavunculus" = Argyrohyrax proavus Ameghino 1897 notoungulate
AMNH 29603
 Notoungulata - Archaeohyracidae
Archaeohyrax patagonicus Ameghino 1897 notoungulate
possibly more than 10 specimens
 Notoungulata - Hegetotheriidae
"Propachyrucos ameghinorum" = Prosotherium garzoni, "Propachyrucos ameghinorum" = Prosotherium garzoni
"Propachyrucos ameghinorum" = Prosotherium garzoni Ameghino 1897 notoungulate
"Propachyrucos ameghinorum" = Prosotherium garzoni Ameghino 1897 notoungulate
 Notoungulata - Notohippidae
? Rhynchippus equinus Ameghino 1897 notoungulate
? Rhynchippus equinus Ameghino 1897 notoungulate