News Paleontology

Did Mammals Spread from Asia? Carbon blip gives clue to animals’ Eden

By Susan Milius

- More than 2 years ago

A new dating of Chinese fossils buttresses the idea that an Asian Eden gave rise to at least one of the groups of mammal species that appeared in North America some 55 million years ago.

LOOKING FOR ANCESTORS. Red sedimentary layers in Wyoming mark the first known North American occurrences of several mammal groups, including the hyaenodontids.