Also known as MdR
Where: Buenos Aires, Argentina (38.6° S, 60.6° W: paleocoordinates 38.7° S, 59.2° W)
• coordinate estimated from map
• small collection-level geographic resolution
When: Irene Formation, Montehermosan (5.0 - 3.8 Ma)
• da Grande (¼Cascada Cifuentes of this paper) exposures. Later, the oldest deposits were grouped into the Irene “Formation” and assigned to the Upper Pliocene (Montehermosan) (Reig, 1955).
• group of beds-level stratigraphic resolution
Environment/lithology: fluvial; conglomerate
•In general, the AUB deposits record a repetitive pattern of destruction-generation of accommodation space, as recorded by the vertical succession of AE1 deposits, OV deposits and AE1 deposits once again. When compared to AUA, it could be assumed that AUB was deposited during a period of more geomorphological instability, when alternating depositional and erosional processes prevailed over pedogenesis. The architectural arrangement of the Neogene deposits of the QS basin (both AUA and AUB deposits) indicates that the sedimentary record might represent the distal reaches of a distributary fluvial system (sensu Nichols and Fisher, 2007) that drained from the Ventania ranges
Size class: mesofossils
Primary reference: E. Beilinson, G. M. Gasparini, R.L. Tomassini, M.A. Zarate, C.M. Deschamps, R.W. Barendregt, and J. Rabassa. 2017. The Quequen Salado river basin: Geology and biochronostratigraphy of the Mio-Pliocene boundary in the southern Pampean plain, Argentina. Journal of South American Earth Sciences 76:362-374 [P. Mannion/M. Kouvari/M. Kouvari]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 198685: authorized by Philip Mannion, entered by Miranta Kouvari on 07.01.2019
Creative Commons license: CC BY (attribution)
Taxonomic list
| Mammalia | |
|
Paedotherium bonaerense Ameghino 1887 notoungulate | |
|
Actenomys priscus Owen 1840 caviomorph | |
|
Caviidae indet. Gray 1821 caviomorph
Orthomyctera sp. Ameghino 1889 caviomorph | |