Platyrrhine fossils first appear in the South American fossil record during the late Oligocene epoch.Since they are not found in earlier fossil-bearing sediments, and South America at that time was essentially an island continent, how do scientists think they got there?

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The Answer of Platyrrhine fossils first appear in the South American fossil record during the late Oligocene epoch.Since they are not found in earlier fossil-bearing sediments, and South America at that time was essentially an island continent, how do scientists think they got there?

Platyrrhine Fossils First Appear in the South American Fossil Record