Geological studies in the northern sector of the Chaco foreland Basin, Bolivia, yielded new
fossils coming from late Oligocene-late Miocene of the Petaca Formation. Few fossil …

One of the most striking characteristics of South America's fossil biota is its strong degree of
endemism. In large part, this autochthony can be explained by the extended period of …

We revise the mammal fossils from the Fray Bentos Formation previously assigned to
Notoungulata, as well as some new remains recovered from levels cropping out in …

The ancient, native ungulates were another fascinating group, which sadly has become
totally extinct, but that we now understand were related to the northern Perissodactyla or odd …

The Cañadón Blanco locality, in Chubut Province (figure 1), is a classical Paleogene site in
Patagonia with mammals mostly collected by Dr. S. Roth. As for other classical collections …

The continental fossil mammals found in Barrancas Blancas,(near Camarones, Southeast of
Chubut Province, Argentina) constitute a new faunal association from the Paleogene of …

In the last few years, the Quebrada de Los Colorados Formation has become an important
middle Eocene fossiliferous unit in Northwestern Argentina. In this unit, the South American …

The biological history of South America is characterized by the strong endemicity of its taxa.
This was a direct consequence of geographic isolation, since South America was an island …

All xenarthrans known to date are characterized by having permanent teeth that are both
high crowned and open rooted, ie, euhypsodont, and with a type of hypsodonty different …

The isolation of South America during most of the Cenozoic allowed the development of a
unique endemic mammalian fauna. Notoungulates, an endemic group of South American …