THE EARTH’S TIME SCALE AND THE FIVE MASS EXTINCTIONS

THE EARTH’S TIME SCALE AND THE FIVE MASS EXTINCTIONS

THE LAST FOUR  EARTH GEOLOGIC ERAS: 1.  PRECAMBRIAN  (570 MILLION YEARS AGO, AND EARLIER). 2.  PALEOZOIC  ( 245 MILLION TO 570 MILLION YEARS AGO). 3.  MESOZOIC (66.4 MILLION TO 245 MILLION YEARS AGO). 4.  CENOZOIC (O-TO 66.4 MILLION YEARS AGO). 5 PRIOR MASS...