The Last 1 Million Years B.P.	0,000,000s BP

900 Thousands Pleistocene Nebraskan Glacial	800,000s - Pleistocene Aftonian Interglacial
700,000s - Pleistocene Aftonian Interglacial Kansan - 750,000 BP Glacial	600,000s - Pleistocene Kansan Glacial Yarmouth - 675,000 BP Interglacial
500,000s  Pleistocene Yarmouth Interglacial	400,000s Pleistocene Controlled use of Fire Yarmouth Interglacial
300,000s Pleistocene Yarmouth Interglacial Illinoan - 375,000 BP Glacial	200,000s Pleistocene Illinoan Glacial Sangamon - 275,000 BP Interglacial
100,000s Pleistocene Sangamon Interglacial Wisconsin - 125,000 BP Glacial	000,000s   Pleistocene / Holocene Wisconsin Glacial Holocene Ice retreats to present position.

0,000,000s

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