Also known as PIRl
Where: Buenos Aires, Argentina (38.7° S, 60.6° W: paleocoordinates 38.8° S, 58.3° W)
• coordinate estimated from map
• small collection-level geographic resolution
When: Irene Formation, Huayquerian (8.0 - 5.0 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; sandstone
•OV element. These lithosomes were generated by unconfined flows connected to episodic overbank flows that flooded the proximal and distal floodplain areas and ended with suspension fallout during the wanning period of the flood. These sedimentary pro- cesses took place in a highly dynamic, high-accommodation context (environment), where non-channelized or poorly- channelized flows prevailed, and few low-sinuosity minor chan- nels drained the floodplain. The uppermost section of AUA is marked by the development of a mature calcic paleosol (Fig. 7), with dominance of pedogenesis over sedimentation and erosion, which indicates a relative prolonged interval of geomorphological stability across the fluvial basin.
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 198689: authorized by Philip Mannion, entered by Miranta Kouvari on 07.01.2019
Creative Commons license: CC BY (attribution)
Taxonomic list
| Mammalia | |
|
Argyrolagus sp. Ameghino 1904 metatherian | |
|
Paedotherium minor Cabrera 1937 notoungulate | |
|
Caviidae indet. Gray 1821 caviomorph | |
|
Xenodontomys ellipticus Kraglievich 1927 caviomorph | |