TIME LINE (as followed in this site)
13.5 b. - 0 BP - universal time
6000 - 4000 m. BP - Hadean Eon =
Cryptozoic Eon
6000 - 570 m. BP - Precambrian Era
6000 - 2500 m. BP - Early Precambrian Era
4000 - 2500 m. BP - Archean Eon =
Archeozoic Eon
2500 -1800 m. BP - Middle Precambrian Era
2500 - 675 m. BP - Proterozoic Eon
2500 -1800 m. BP - Early or Paleoproterozoic Period
1800 -1000 m. BP - Middle or Mesoproterozoic Period
1800 - 570 m. BP - Late Precambrian Era
1000-675 m. BP - Upper or Neoproterozoic Period
675 m.- 0 BP -
Phanerozoic Eon
675-570 m. BP - Ediacaran Period
570-245 m. BP - Paleozoic Era
570 - 500 m. BP - Cambrian Period
500 - 440 m. BP - Ordovician Period
440 - 400 m. BP - Silurian Period
400 - 345 m. BP - Devonian Period
345 - 280 m. BP - Carboniferous Period
345 - 310 m. BP - Mississippian Period
310 - 280 m. BP - Pennsylvanian Period
280 - 245 m. BP - Permian Period
245 - 65 m. BP - Mesozoic Era
245 - 208 m. BP - Triassic Period
208 - 146 m. BP - Jurassic Period
146 - 65 m. BP - Cretaceous Period
65 - 0 m. BP - Cenozoic Era
65 - 2 m. BP - Tertiary Period
65 - 58 m. BP - Paleocene Period
58 - 38 m. BP - Eocene Period
38 - 24 m. BP - Oligocene Period
24 - 8 m. BP - Miocene Period
8 - 2 m. BP - Pliocene Period
2 m. - 11,000 BP - Pleistocene Period
11,000 - 0 BP - Holocene Period
11,000 - 9500 BP - Late Paleo Period
9500 - 7000 BP - Early Archaic Period
7000 - 5000 BP- Middle Archaic Period
5000 - 2600 BP- Late Archaic Period
2600 - 2250 BP - Early Woodland Period
2250 - 1550 BP - Middle Woodland Period
1550 - 1100 BP - Late Woodland Period
1100 - 800 BP - Early Mississippian Period