Comallo (Miocene of Argentina)

Where: Rio Negro, Argentina (41.1° S, 70.1° W: paleocoordinates 41.7° S, 65.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Colloncuran mammal zone, Collón Cura Formation, Langhian (16.0 - 13.8 Ma)

• A recent 40Ar/39Ar analysis in amphibole crystals collected from fresh pumice clasts revealed an age of 14.86 ± 0.13 Ma for the middle section of the Collón Curá Formation in the Gastre Basin (Bilmes et al. 2013), placing this unit and its fauna in the middle Miocene (Langhian)

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; tuffaceous sandstone

• In general terms, the Collón Curá Formation is character-

•ized by tuff, sandstone, and ignimbrite, bearing fossil mam- mals below and above the Pilcaniyeu Ignimbrite Member (Vucetich et al. 1993; Cucchi et al. 1998; Escosteguy et al. 2013).

Size class: macrofossils

Primary reference: B. Vera, M. Reguero, and L. González-Ruiz. 2017. The Interatheriinae notoungulates from the middle Miocene Collón Curá Formation in Argentina. Acta Palaeontologica Polonica 62(4):845-863 [P. Mannion/M. Kouvari]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 198569: authorized by Philip Mannion, entered by Miranta Kouvari on 18.12.2018, edited by Grace Varnham

Creative Commons license: CC BY (attribution)

Taxonomic list

• Some specimens are new and some are un-published specimens of Roth’s (1899) old collection curated at Museo de La Plata.
Mammalia
 Sparassodonta -
Cladosictis patagonica1 Ameghino 1887 metatherian
MAPBAR-5150, partial cranium with dentition; MAPBAR-7798, fragment of right maxilla with M2–M3
 Notoungulata - Hegetotheriidae
Hemihegetotherium tantillum2 Vera 2019 notoungulate
 Notoungulata - Interatheriidae
"Protypotherium endiadys" = Protypotherium praerutilum Ameghino 1887 notoungulate
Protypotherium colloncurensis Vera et al. 2017 notoungulate