ocr: Back 12 11 1U 3 8 6 l 3m years ago... 2 milion years ago... 4 million 3 million 2 million 1r million 900,000 800,000 700,000 3.41 million years ago... 1.75 2 million years ago... 1n million years ago... Cenozoic 2imyai to present Quaternary 2imya) to present Pleistucene 2imyal to 10,000 years ago.
