What continental setting characterized South America during the Late Miocene, influencing the evolution of Rhamphosuchus?

Answer

Relatively isolated

During the Late Miocene, the continent was relatively isolated, which often resulted in the evolution of incredibly large endemic species.

What continental setting characterized South America during the Late Miocene, influencing the evolution of Rhamphosuchus?
habitatanimalpaleontologyPrehistoricRhamphosuchus