Monte León (Miocene of Argentina)

Where: Santa Cruz, Argentina (50.3° S, 68.9° W: paleocoordinates 50.9° S, 63.2° W)

• coordinate stated in text

• local area-level geographic resolution

When: Santa Cruz Formation, Santacrucian (17.5 - 16.3 Ma)

• formation-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: mesofossils

Collected by C. Ameghino, Barnum Brown; reposited in the AMNH, MACN, MLP

Primary reference: S. F. Vizcaíno, R. F. Kay, and M. S. Bargo. 2012. Background for a paleoecological study of the Santa Cruz Formation (late Early Miocene) on the Atlantic Coast of Patagonia. In S. F. Vizcaí­no, R. F. Kay, M. S. Bargo (eds.), Early Miocene Paleobiology in Patagonia: High-Latitude Paleocommunities of the Santa Cruz Formation 1-22 [J. Zijlstra/J. Zijlstra/J. Zijlstra]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 176563: authorized by Jelle Zijlstra, entered by Jelle Zijlstra on 17.02.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Squamata -
Diasemosaurus occidentalis n. gen. n. sp.3, Dibolosodon typicus n. gen. n. sp.3
Diasemosaurus occidentalis n. gen. n. sp.3 Ameghino 1893 tegu
MACN-A 5806a-b
Dibolosodon typicus n. gen. n. sp.3 Ameghino 1893 tegu
MACN-A 621
Mammalia
 Primates - Homunculidae
Homunculus patagonicus5 Ameghino 1891 monkey
MLP 55-XII-13-156, m1 (m2 according to ref. 47173)
 Rodentia - Acaremyidae
Acaremys murinus2 Ameghino 1887 caviomorph
MACN PV SC2339, SC2347, SC2410
 Cingulata - Dasypodidae
Stenotatus sp.8 Ameghino 1891 armadillo
MLP 55-III-3-10, skull and mandible
 Sparassodonta -
"Pseudonotictis pusillus" = Pseudonotictis pusillus7, "Hathliacynus kobyi n. sp." = Pseudonotictis pusillus6, "Agustylus primaevus n. sp." = Cladosictis patagonica6, "Hathliacynus fischeri n. sp." = Cladosictis patagonica6, "Cladosictis dissimilis n. sp." = Cladosictis patagonica6, Acyon tricuspidatus n. gen. n. sp.6, "Sipalocyon gracilis" = Sipalocyon gracilis6, "Thylacodictis exilis n. sp." = Sipalocyon gracilis6
"Pseudonotictis pusillus" = Pseudonotictis pusillus7 Ameghino 1891 metatherian
MLP 11-40, dentary m1
"Hathliacynus kobyi n. sp." = Pseudonotictis pusillus6 Ameghino 1891 metatherian
MLP 11-26, jaws, skull fragments, postcrania
"Agustylus primaevus n. sp." = Cladosictis patagonica6 Ameghino 1887 metatherian
MLP 11-4, mandible c-m1, m3-4
"Hathliacynus fischeri n. sp." = Cladosictis patagonica6 Ameghino 1887 metatherian
MLP 11-19, partial skull and mandibles
"Cladosictis dissimilis n. sp." = Cladosictis patagonica6 Ameghino 1887 metatherian
MLP 11-86, maxillary M2-4
Acyon tricuspidatus n. gen. n. sp.6 Ameghino 1887 metatherian
MLP 11-64, dentary p3-m4, holotype
"Sipalocyon gracilis" = Sipalocyon gracilis6 Ameghino 1887 metatherian
MLP 11-22, dentary p3-m2; MLP 11-39, mandible left m1, right m1
"Thylacodictis exilis n. sp." = Sipalocyon gracilis6 Ameghino 1887 metatherian
MLP 11-12, mandible m1-2
 Sparassodonta - Borhyaenidae
Arctodictis munizi n. gen. n. sp.4 Mercerat 1891 metatherian
MLP 11-85, holotype, left dentary with p1-m4 and right with p3
Borhyaena tuberata7 Ameghino 1887 metatherian
 Paucituberculata - Palaeothentidae
Acdestis lemairei1 Bown and Fleagle 1993 marsupial
"Acdestis owenii" = Acdestis oweni1 Ameghino 1887 marsupial
Palaeothentes aratae1 Moreno 1882 marsupial
Palaeothentes intermedius1 Ameghino 1887 marsupial
Palaeothentes minutus1 Ameghino 1887 marsupial
Palaeothentes lemoinei1 Ameghino 1887 marsupial