-
50,000 BCE
Eon: Phanerozoic Era: Cenozoic Period: Quaternary Epoch: Pleistocene
Bison come to North America -
20,000 BCE
Eon: Phanerozoic Era: Cenozoic Period: Quaternary Epoch: Pleistocene
Humans come to North America -
10,000 BCE
Eon: Phanerozoic Era: Cenozoic Period: Quaternary Epoch: Holocene
the beginning of the Holocene.
Origin of the Prairies