Where: Buenos Aires, Argentina (37.2° S, 62.8° W: paleocoordinates 37.3° S, 60.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Epecuén Formation, Huayquerian (8.0 - 5.0 Ma)

• The fossils were extracted from two different layers, placed in accordance with each other, as can be seen in the ravines of the small dry channels that cut the Robillote field.

•The upper layer, a very polished yellowish-gray in color, consists of extremely fine-grained and crumbly silt, consisting mainly, according to an analysis that I owe to the kindness of Dr. Walther Schiller, by crypto-Christian calcium carbonate.

•This layer, which is superficial in the Robilotte field, is the one that has provided the largest number of fossils. The layer underneath is a more compact material, much harder and reddish-ocher in color, and it seems to be the least frequent fossil remains. In the bed of the lagoon of Los Paraguayos, this is the terrain that appears superficially.

•I do not want to venture to designate these layers with particular names, further complicating the too leafy nomenclature of our formations, and I will limit myself to saying that they evidently belong to the Pliocene, judging by their fossils, which show close links with those of the Araucanian .

•As corresponds to their relative position, those of the ocreous layer present somewhat more archaic characteristics than those of the

•gray, which is undoubtedly Upper Pliocene; but the difference in antiquity between the two fans must not, however, have been very great.

•

•From newer literature, the Epecuen formation has been dated as Huayquerian.

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; gray, yellow, calcareous siltstone and condensed, red, yellow, calcareous siltstone

Size class: macrofossils

Collected by Cabrera, Alsina in 1939

Primary reference: A. Cabrera. 1939. Sobre Vertebrados Fósiles del Plioceno de Adolfo Alsina. Revista del Museo de La Plata 2(6):3-35 [P. Mannion/M. Kouvari]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 212302: authorized by Philip Mannion, entered by Miranta Kouvari on 09.08.2020

Creative Commons license: CC BY (attribution)