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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). FIRST:  85% OF ALL SPECIES INCLUDING MARINE INVERTEBRATES.  (LATE ORDOVICIAN 440 MILLION YEARS AGO).  A GLOBAL ICE AGE, FOLLOWED BY FOLLOWED BY A RAPID WARMING. GLOBAL 2ND:  LATE DEVONIAN PERIOD AROUND 374 MILLION YEARS AGO.  75% OF ALL SPECIES WIPED OUT.  BOTTOM- DWELLING  INVERTEBRATES IN TROPICAL SEAS.(HIGH VARIATIONS IN SEA LEVELS AND RAPID COOLING AND WARMING PERIODS). 3RD:  95% OF ALL SPECIES, INCLUDING MARINE ANIMALS. THE MOST DEVASTATING ONE, IN THE PERMIAN PERIOD AROUND 250 MILLION YEARS AGO., ASTEROID IMPACT, BLOCKED SUN, AND ACID RAINS, 4TH:  80%  OF ALL SPECIES.  ALL TYPES, GONE.  50 MILLION YEARS AFTER THE GREAT PERMIAN EXTINCTION.  DURING THE TRIASSIC PERIOD.  CAUSED BY A COLOSSAL GEOLOGICAL ACTIVITY IN THE ATLANTIC OCEAN. HIGH TEMPS AND ACIDIFIED OCEANS. 5TH:  THE CRETACEOUS PERIOD.  76% GONE. THE NON-AVIAN DINOSAURS.  145 MILLION YEARS AGO. A 6TH MASS EXTINCTION MAY BE UNDERWAY. A terrible mass extinction was inevitable. Only 5% of the population of life on Earth survived and 95% perished from massive drought, lack of oxygen, and acid rain that made plants unable to survive.
  • Ordovician-silurian Extinction: 440 million years ago.
  • Devonian Extinction: 365 million years ago.
  • Permian-Triassic Extinction: 250 million years ago.
  • Triassic-Jurassic Extinction: 210 million years ago.
  • Cretaceous-tertiary Extinction: 65 Million Years Ago.
 
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