Great barranca south of Lake Colhue-Huapi (Mustersan) (Eocene of Argentina)

Where: Chubut, Argentina (45.7° S, 68.9° W: paleocoordinates 48.2° S, 59.1° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Mustersan (48.0 - 42.0 Ma)

• Bed is 169 m above the base of the barranca, immediately above the Casamayoran AMNH collection (3e), defining the Casamayoran/Mustersan contact

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; tuff

• Hard, concretionary, cornice-forming tuff, so-called "tosquilla"

Size classes: macrofossils, mesofossils

Collection methods: Feruglio collection given to Simpson

Primary reference: G. G. Simpson. 1937. A specimen of Pseudostylops subquadratus Ameghino. Memorie degli Istituti di Geologia e Mineralogia dell'Universita di Padova 11:1-12 [J. Alroy/J. Wertheim/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 23371: authorized by John Alroy, entered by Jill Wertheim on 12.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

 Theriamorpha - Pyrotheriidae
Propyrotherium cf. saxeum Ameghino 1901 placental
 Notoungulata - Archaeohyracidae
? Archaeohyrax sp. Ameghino 1897 notoungulate
Eohyrax sp. Ameghino 1901 notoungulate
 Notoungulata -
"Pseudostylops subquadratus" = Eomorphippus obscurus, ? Periphragnis sp.
"Pseudostylops subquadratus" = Eomorphippus obscurus Ameghino 1901 notoungulate
? Periphragnis sp. Roth 1899 notoungulate