Paleontologists have discovered two skulls from the first known mammal of the early Late Cretaceous period of South America. The fossils break a roughly 60 million-year gap in the currently known mammalian record of the continent and provide new clues on the early evolution of mammals.

Source: 'Saber-toothed squirrel': First known mammalian skull from Late Cretaceous in South America


David Cottle

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