PaleontologybioRxiv
A fossil fish assemblage from the middle Miocene of the Cocinetas Basin, northern Colombia
G. A. Ballen, C. Jaramillo, F. C. P. Dagosta, M. C. C. de Pinna
The paper analyzes Miocene fish fossils from Colombia to show that river systems connected Amazonia and the Guajira Peninsula, challenging the idea that the Andes were a complete barrier until 11 Myr ago.
DOI 10.1002/spp2.1405