Where: Buenos Aires, Argentina (38.5° S, 58.5° W: paleocoordinates 38.5° S, 58.2° W)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Ensenadan mammal zone, lithofacies B Member, Ensenadan (1.8 - 0.4 Ma)
• "Nivel D" De los Reyes et.al.2006 and Bogan et.al. 2009
•"Nivel B" Baez et.al. 2008
•Early Pleistocene.
•
•Lucero, et al. 2008: Stratigraphic succession is relatively homogeneous, at least at its higher levels, and the entire profile highlights the presence of possible horizons of possible regional extension. According to DE LOS REYES et al. (2006), in the exposed profile a set of stratigraphic units possibly referring to the late Pliocene-late Pleistocene interval (Piso-Ages Ensenadense, Bonaerense and Lujanense, corresponding to the Biozones of Mesotherium cristatum, Megatherium americanum and Equus (Amerhippus)) are represented. neogaeus, respectively)
•The specimen comes from the basal sector of the profile, lithofacies B (figure 1). The
•The power of the carrier unit varies between 0.50 and 1 m
•
•Recent studies on magnetostratigraphy (E. Soibelzon com. Pers. M.
•MC) carried out in CdM indicate that the units of the middle and upper section have normal polarity (EN lithofacies), while the presence of a reverse polarity event was detected in unit D. Following this last criterion, the Brunhes-Matuyama limit it would be at the base of the sequence (between lithofacies E and D) and the whole of the DA units would be older than 0.78 Ma.
• bed-level stratigraphic resolution
Environment/lithology: terrestrial; brown, argillaceous siltstone
•Lucero, et al. 2008: lithologically composed of loossoid silts of dark brown coloration, massive and easily discernible by the few limestone concretions present, as well as by its characteristic tabular structure. Its base is observable in numerous sectors on the abrasion platform and its roof is generally exposed at the base of the cliff. It rests in discordance on the paleosurface that affects the A. 1 and 3 m lithofacies, lithologically composed of dark brown sandy loessoid silts. The finding of Mesotherium sp. (U. F. J. Pardiñas, pers. Comm. M. M. C.) together with the fauna association recently reported by DE LOS REYES et al. (2006), suggest including the set of units corresponding to the baseline sector of the CdM profile (units A-D) to the Ensenadense Floor-Age (= Biozone of Mesotherium cristatum).
Size classes: macrofossils, mesofossils
Reposited in the MLP
Primary reference: S. O. Lucero, F. L. Agnolin, R. E. Obredor, R. F. Lucero, M. M. Cenizo and L. L. Reyes. 2008. Una nueva especie del genero Ctenomys (Mammalia; Rodentia) del Plioceno tardio - Pleistoceno medio del sudeste de la provincia de Buenos Aires, Argentina. Studia Geologica Salmanticensia 44(2):163-175 [P. Mannion/M. Kouvari]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 207681: authorized by Philip Mannion, entered by Miranta Kouvari on 27.01.2020
Creative Commons license: CC BY (attribution)
Taxonomic list
| Mammalia | |
Ctenomys thomasi n. sp.
| |