ocr: Geologic History Holocene 10,000 yeas ago to now - Paleocens Eosens Cenozoic 25, Miocens. Oligocene Tertiary 38, 55, Pliocens. Pleistocene 651 Cretaceous 144 Mesozoic Jurrasic 2137:: Triassic 248; 286 7Permian'. Late Paleozoic Carboniferous 360A Devonian: 408, Silurian' 4381 Early Paleozoic - 505, Ordovician Cambrian millions of years ago