Also known as Cifuentes or de Aldaya, 2.85 km downstream from RN3
Where: Buenos Aires, Argentina (38.6° S, 60.6° W: paleocoordinates 38.7° S, 59.5° W)
• coordinate stated in text
• small collection-level geographic resolution
When: Irene Formation, Early/Lower Pliocene (5.3 - 3.6 Ma)
• Prevosti et al. 2021: On analysis, one aliquot of a sample from QSLo (lower Quequén Salado, Paso del Halcón) presented extensive evidence of excess argon in the first half of the spectrum, but the final steps representing about 50% of released 39Ar yielded an age of 5.17 ± 0.08 Ma. A single aliquot of a sample from QSUp (upper Quequén Salado, Cascada Grande) gave an age of 4.33 ± 0.06 Ma. Our results close almost a century of argument concerning the relative antiquity of the “Irenean”( Kraglievich 1934, Goin et al. 1994, Pardiñas et al. 2017, Beilinson et al. 2017). The controversial lower fauna from the Quequén Salado River can now be shown to be of Zanclean age (5.17 Ma) and thus well within the Early Pliocene. Its upper fauna is also Early Pliocene (4.33 Ma), a point previously unclear.
Environment/lithology: terrestrial; paleosol/pedogenic, nodular, calcareous claystone and carbonate
Size class: macrofossils
Reposited in the MLP
Primary reference: U. F. J. Pardinas, F. J. Prevosti, D. Voglino and M. Cenizo. 2017. A controversial unit within the argentine neogene: the “Irenean” fauna. Ameghiniana 54(6):655-680 [E. Vlachos/E. Vlachos]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 191769: authorized by Evangelos Vlachos, entered by Evangelos Vlachos on 14.02.2018, edited by Kateryn Pino
Creative Commons license: CC BY (attribution)
Taxonomic list
Mammalia | |
Hyperdidelphys inexpectata Ameghino 1889 opossum | |
Argyrolagus sp. Ameghino 1904 metatherian | |
Paedotherium sp. Burmeister 1888 notoungulate | |
Glyptodontidae indet. Burmeister 1879 glyptodon | |
Doellotatus sp. Bordas 1932 armadillo | |
Promacrauchenia chapadmalense placental | |
Cyonasua sp. Ameghino 1885 procyonid carnivore | |
Eumysops laeviplicatus Ameghino 1888 spiny rat | |
Actenomys sp. Burmeister 1888 caviomorph | |
"Lagostomus incisus" = Lagostomus (Lagostomopsis) incisus
"Lagostomus incisus" = Lagostomus (Lagostomopsis) incisus Ameghino 1888 viscacha | |
Amphibia | |
Ceratophrys sp. Wied 1824 South American horned frog |