Geological Time

( K = THOUSANDS OF YEARS AGO ) 
( M = MILLIONS OF YEARS AGO ) 

RECENT - 70 M                     CENOZOIC ERA
     Recent - 3.7 M            Quaternary Period
     Recent - 10 K                Holocene Epoch
     10 K - 3.7 M               Pleistocene Epoch
     3.7 M - 70 M                   Tertiary Period
     3.7 M- 9 M                      Pliocene Epoch
     9 M - 24 M                      Miocene Epoch
     24 M - 40 M                  Oligocene Epoch
     40 M - 56 M                      Eocene Epoch
     56 M- 70 M                   Paleocene Epoch
70 M - 245 M                          MESOZOIC ERA
     70 M- 146 M               Cretaceous Period
     146 M - 200 M                 Jurassic Period
     200 M- 245 M                  Triassic Period
245 M - 570 M                       PALEOZOIC ERA
     245 M - 290 M                Permian Period
     290 M - 325 M       Pennsylvanian Period
     325 M - 360 M       Mississippian Period
     360 M - 410 M              Devonian Period
     410 M - 435 M                 Silurian Period
     435 M - 515 M            Ordovician Period
     515 M - 570 M               Cambrian Period
570 M- *4,500 M              PRECAMBRIAN ERA
     *4,500 M         Approx origin of the Earth