Robilotte field - SE of Epecuén lagoon & E of Laguna de Epecuén: Huayquerian, Argentina
collected by Cabrera, Alsina 1939

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Notoungulata - Mesotheriidae
the type? MLP 37-III-7-5
the type? MLP 37-III-7-1
the type? MLP 37-III-7-9
Mammalia - Panameriungulata - Proterotheriidae
the type
the type
Mammalia - Panameriungulata - Macraucheniidae
the type
Mammalia - Cingulata
the type
the type
the type
Reptilia - Gruiformes - Phorusrhacidae
the type
see common names

Geography
Country:Argentina State/province:Buenos Aires County:Adolfo Alsina
Coordinates: 37.2° South, 62.8° West (view map)
Paleocoordinates:36.9° South, 61.1° West (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Neogene
10 m.y. bin: Cenozoic 6
Key time interval: Huayquerian
Age range of interval: 8 - 5 m.y. ago
Stratigraphy
Formation:Epecuén
Stratigraphic resolution:bed
Stratigraphy comments: 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.
Lithology and environment
Primary lithology:very fine,gray,yellow calcareous siltstone
Secondary lithology:condensed,red,yellow calcareous siltstone
Includes fossils?Y
Includes fossils?Y
Lithology description: 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.
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collectors:Cabrera, Alsina Collection dates:1939
Metadata
Database number:212302
Authorizer:P. Mannion Enterer:M. Kouvari
Modifier:M. Kouvari Research group:vertebrate
Created:2020-08-09 14:28:29 Last modified:2025-02-22 15:12:02
Access level:the public Released:2020-08-09 14:28:29
Creative Commons license:CC0
Reference information

Primary reference:
73330. 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]