ocr: Back 12 - 8) l 6 5 4) 3 - 2) X 1 425m years ago... 350m years ago... 360m years ago... 270m years ago... 425 million 400 million 375 million 350 million 300 million 275 million 250 million 420m years ago... 370m years ago... 300m years ago... 270m years ago... 400m years ago... 340m years ago... Devonian Mississippian Pennsylvanian 315/myal to 286(mya) 412/myal to 354(mya) 354mya) to 315(mya) Permian 286/mya) to 248(mya)
