Where: Jujuy, Argentina (23.1° S, 65.6° W: paleocoordinates 25.9° S, 53.8° W)

• small collection-level geographic resolution

When: Mealla Formation (Santa Bárbara Group), Selandian to Selandian (61.6 - 56.0 Ma)

• Late Danian-early Selandian based on Zimicz et al. (2020), but del Papa et al. (2022) provided an absolute date for the upper levels of the Mealla Fm., giving a U–Pb zircon age of 58 Ma. del Papa et al. (2022) proposed a temporal range of 61–57 Ma for the Mealla Fm.

•Mealla Formation, 43 m above the contact with the Yacoraite Formation.

•Originally identified as Riochican SALMA, Woodburne et al. (2014) considered Simpsonotus to come from the Itaboraian SALMA of early Eocene age. Originally identified as Riochican SALMA, Woodburne et al. (2014) listed Simpsonotus as from the Itaboraian SALMA of early Eocene age, but also noted that "The Mealla and Maíz Gordo formations are likely of pre-Itaboraian early and middle Paleocene age"

•Marquillas et al. (2011: Cenozoic Geology of the Central Andes of Argentina, 227-246) show the Mealla Formation as Middle to Late Paleocene.

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Primary reference: R. Pascual, M. G. Vucetich, and J. Fernandez. 1978. Los primeros mamiferos (notoungulata, henricosborniidae) de la Formacion Mealla (Grupo Salta, subgrupo Santa Barbara) : sus implicancias filogeneticas, taxonomicas y cronologicas. Ameghiniana 15:366-390 [R. Butler/R. Butler/R. Butler]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 175870: authorized by Richard Butler, entered by Richard Butler on 16.01.2016

Creative Commons license: CC BY (attribution)