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A New Chronology for Middle Eocene-Early Miocene South American Land Mammal Ages
Cenozoic South American Land Mam- mal Ages (SALMAs) have historically been correlated to the geologic time scale using 40 Ar/ 39 Ar dating and magnetostratigraphy. At Gran Barranca (68.7°W,… Expand
Paleogene Land Mammal Faunas of South America; a Response to Global Climatic Changes and Indigenous Floral Diversity
In addition to being composed of essentially different groups of mammals, those of the South American continent seem to have responded to the climatic changes associated with the ECCO and subsequent conditions in a pattern that was initially comparable to, but subsequently different from, their North American counterparts. Expand
Crocodylian diversity peak and extinction in the late Cenozoic of the northern Neotropics.
- T. Scheyer, O. A. Aguilera, +6 authors M. Sánchez-Villagra
- Geography, Medicine
- Nature communications
- 21 May 2013
A diversity peak in sympatric occurrence of at least seven species is shown, based on detailed stratigraphic sequence sampling and correlation, involving four geological formations from the middle Miocene to the Pliocene, and on the discovery of two new species and a new occurrence. Expand
Miocene vertebrates from Entre Ríos province , eastern Argentina
Resumen.VERTEBRADOS DEL MIOCENO DE LA PROVINCIA DE ENTRE RÍOS, ARGENTINA. La diversa fauna de antiguos vertebrados que se registra en los acantilados que bordean la margen oriental del río Paraná… Expand
Paleobiogeography of the late Pleistocene pampatheres of South America
Abstract This paper deals mainly with the paleobiogeography of the South American Pampatheriidae of the late Pleistocene. Through analysis, we conclude that (1) the species of Quaternary pampatheres… Expand
Revised geochronology of the Casamayoran South American Land Mammal Age: climatic and biotic implications.
- R. F. Kay, R. H. Madden, +5 authors H. Sandeman
- Geology, Biology
- Proceedings of the National Academy of Sciences…
- 9 November 1999
The appearance of large numbers of hypsodont taxa in South America occurred sometime between 36 and 32 Ma (late Eocene-early Oligocene), at approximately the same time that other biotic and geologic evidence has suggested the Southern high latitudes experienced climatic cooling associated with Antarctic glaciation. Expand
Linked canopy, climate, and faunal change in the Cenozoic of Patagonia
A method for reconstructing leaf area index (LAI) based on light-dependent morphology of leaf epidermal cells and phytoliths derived from them is presented and, using this proxy, LAI for the Cenozoic of middle-latitude Patagonia is reconstructed. Expand
Osteoderm morphology in recent and fossil euphractine xenarthrans
An early split of both subfamilies is suggested and the hypothesis that the Euphractinae are more derived than the Dasypodinae is supported, supporting the notion that these taxa are phylogenetically closely related. Expand
Paleogene land mammal faunas of South America
Decoupling the spread of grasslands from the evolution of grazer-type herbivores in South America.
- C. Strömberg, R. Dunn, R. H. Madden, M. Kohn, A. Carlini
- Biology, Medicine
- Nature communications
- 12 February 2013
It is shown that although open-habitat grasses existed in southern South America since the middle Eocene, they were minor floral components in overall forested habitats between 40 and 18 Myr ago, and distinctly different, continent-specific environmental conditions (arid grasslands versus ash-laden forests) triggered convergent cheek-tooth evolution in Cenozoic herbivores. Expand