Sierra del Portezuelo Norte SPN (Miocene of Argentina)

Also known as SPN

Where: Neuquén, Argentina (38.9° S, 69.5° W: paleocoordinates 39.6° S, 64.0° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Cerro Bandera Formation, Colhuehuapian (21.0 - 17.5 Ma)

• the fossil- bearing deposits of the Cerro Bandera Formation correlate with the Lower Faunal Zone in the Colhue Huapi Member of the Sarmiento Formation at Gran Barranca (south of Colhue Huapi Lake, central Patagonia), dated at 21.1–20.1 Ma (Dunn et al., 2013), the type section for the Colhuehuapian South American Land Mammal Age (SALMA).

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial; paleosol/pedogenic, tuffaceous volcaniclastic sediments

• In Sierra del Portezuelo Norte (Loc. SPN, Fig. 1.1) the level bearing the remains described herein is a pedogenized tuffaceous chonite (sensu Teruggi et al., 1978) with poorly preserved scarabeid nests, about 21 m from the base of the stratigraphic section exposed in the area

Size class: mesofossils

Collected in 2015; reposited in the MACN, MLP

Primary reference: A. Kramarz, A. Garrido, A. Forasiepi, M. Bond, and C. Tambussi. 2005. Estratigrafía y vertebrados (Aves y Mammalia) de la Formación Cerro Bandera, Mioceno Temprano de la Provincia del Neuquén, Argentina. Revista Geológica de Chile 32(2):273-291 [D. Croft/D. Croft]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89029: authorized by Darin Croft, entered by Darin Croft on 29.04.2009, edited by Miranta Kouvari and Juan Carrillo

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Cingulata - Propalaehoplophoridae
Propalaehoplophorinae indet. Ameghino 1891 edentate
 Cingulata - Peltephilidae
 Cingulata - Chlamyphoridae
Proeutatus sp. Ameghino 1891 edentate
Prozaedyus sp. Ameghino 1891 edentate
 Cingulata - Dasypodidae
Astegotheriini indet. Ameghino 1906 armadillo
 Notoungulata - Interatheriidae
Protypotherium sp., "Protypotherium sinclairi n. sp." = Protypotherium columnifer2
Protypotherium sp. Ameghino 1882 notoungulate
"Protypotherium sinclairi n. sp." = Protypotherium columnifer2 Fernández et al. 2021 notoungulate
Holotype: PVPH 352, partial right mandibular ramus with i2– m2
 Notoungulata - Toxodontidae
Proadinotherium cf. muensteri Ameghino 1902 notoungulate
 Panameriungulata - Macraucheniidae
Cramauchenia normalis Ameghino 1902 placental
 Rodentia -
Caviocricetus lucasi Vucetich and Verzi 1996 caviomorph
 Rodentia - Chinchillidae
Eoviscaccia australis Vucetich 1989 chinchilid
 Rodentia - Neoepiblemidae
Perimys sp. Ameghino 1887 caviomorph
 Rodentia -
Banderomys leanzai1 Kramarz 2005 caviomorph
 Sparassodonta - Hathliacynidae
"Hathliacynidae indet." = Hathlyacininae
"Hathliacynidae indet." = Hathlyacininae Ameghino 1894 metatherian
 Sparassodonta -
Cladosictis sp. Ameghino 1887 metatherian
Sipalocyon sp. Ameghino 1887 metatherian
 Sparassodonta - Borhyaenidae
 Paucituberculata - Abderitidae
Pitheculites sp. Ameghino 1901 marsupial
Abderites sp. Ameghino 1887 marsupial