Alto Río Cisnes (Miocene of Chile)

Where: Aisén, Chile (44.6° S, 71.2° W: paleocoordinates 45.2° S, 66.3° W)

• coordinate stated in text

• local area-level geographic resolution

When: Friasian mammal zone, Río Frias Formation, Friasian (16.3 - 15.5 Ma)

• formation-level stratigraphic resolution

Environment/lithology: fluvial; tuff and fine-grained, medium, brown, white sandstone

• The sediments of the Río Frías Formation were deposited in a high energy continental fluvial environment.
• This unit consists of dacitic and rhyolitic tuffs, tuffites, siltstones, and fine to medium sands which are principally white, light brown and/or orange in color. The sediments are generally well stratified, poorly consolidated and horizontal to subhorizontal, dipping ca. 30 to the north.

Size class: macrofossils

Reposited in the MNHN

Primary reference: L. G. Marshall. 1990. Fossil Marsupialia from the type Friasian Land Mammal Age (Miocene), Alto Rio Cisnes, Aisen, Chile. Revista Geológica de Chile 17(1):19-55 [C. Jaramillo/J. Carrillo/J. Carrillo]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 139845: authorized by Carlos Jaramillo, entered by Juan Carrillo on 19.02.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Primates -
Platyrrhini indet. Geoffroy 1812 monkey
 Sparassodonta -
Cladosictis patagonica Ameghino 1887 metatherian
Sipalocyon gracilis Ameghino 1887 metatherian
 Sparassodonta - Borhyaenidae
Prothylacynus patagonicus Ameghino 1891 metatherian
Borhyaena tuberata Ameghino 1887 metatherian
 Microbiotheria - Microbiotheriidae
Microbiotherium tehuelchum Ameghino 1887 marsupial
 Paucituberculata - Palaeothentidae
Parabderites bicrispatus Ameghino 1902 marsupial
Palaeothentes intermedius Ameghino 1887 marsupial
Palaeothentes minutus Ameghino 1887 marsupial
Palaeothentes lemoinei Ameghino 1887 marsupial
 Paucituberculata - Pichipilidae
Pichipilus halleuxi n. sp. Marshall 1990 marsupial
 Paucituberculata - Abderitidae
Pitheculites rothi n. sp. Marshall 1990 marsupial
Abderites meridionalis Ameghino 1887 marsupial