jan 1, 66000000 BC - Beginning of Cenozoic Era: 66 mya

Description:

-The era began on a big down note (extinction of non-avian dinosaurs)
-much warmer than it is today. Most significant of the global warming
-the number and diversity of mammals exploded.
-Known as Age of Mammals
-As the period ends, dogs, cats and pigs become commonplace
-more than half the world’s petroleum occurs in such rocks of this age.
-Several of the world’s great mountain ranges were built during the Cenozoic.