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In Brazilian Intertropical Region (BIR) fossil remains of the giant ground sloth Eremotherium laurillardi (Lund, 1842) and of the proboscidean Notiomastodon platensis (Ameghino, 1888) are the most abundant among megaherbivores. However, the paleoecology of both species needs to be better understood to enlighten why these species disappear in the end of the Pleistocene, an issue that is still debated...
La mesure par analyseur élémentaire des teneurs en azote et en carbone de petites quantités d'ossements anciens à dater par le radiocarbone permet de quantifier la quantité de collagène conservée et la quantité de contamination carbonée exogène. Une telle mesure peut être effectuée sur un grand nombre d'échantillons et permet de trier les spécimens dont le collagène est le mieux conservé pour un site...
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