The Last 100 Million Years B.P.	000,000,000s BP

90 Millions: Mesozoic Era - Cretaceous Period c. 94 M BP Map	80,000,000s - Mesozoic Era - Cretaceous Period
70,000,000s - Mesozoic Era - Cretaceous Period	60,000,000s -   Mesozoic Era / Cenozoic Era Cretaceous Period Map Dinosaurs become extinct 65,000,000 BP Paleocene begins Early mammals diversify.
50,000,000s  Cenozoic Era Eocene Epoch Map 50.2 M to 36,000,000 BP Apperance of many modern mammal groups.	40,000,000s Cenozoic Era Eocene Epoch Apperance of many modern mammal groups.
30,000,000s Cenozoica Eocene Epoch 36,000,000 BP Oligocene Epoch Many early mammals become extinct.	20,000,000s Cenozoic Era Oligocene Epoch Many early mammals become extinct. 22,000,000 BP Miocene Epoch Rise & Spread of grasslands, associated with spread of grazing mammals.
10,000,000s Cenozoic Miocene Epoch Map Rise & Spread of grasslands, associated with spread of grazing mammals.	00,000,000s   Cenozoic Era Miocene Epoch 7,000,000 BP Pliocene Epoch Many mammals become extinct. Appearance of hominids. > 2,000,000 BP Pleistocene Epoch Ice covers much of Europe & N. America. 10,000,000 BP Holocene Ice retreats to present position.

000,000,000s

Sources: AN INSTANT GUIDE TO PREHISTORIC LIFE, Pamela Forey 1988 Bonanza Books
Hammond Physical World Atlas 1988