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Five mass extinctions on the Earth, image, image, image, image, image,…
Five mass extinctions on the Earth
Ordovician
About 440 - 450 million years ago
Causes:
Global cooling
Lowering of the sea level
Species affected:
Graptolites, close to total extinct
Trilobites
Devonian
About 416 to 359 million years ago
Species affected:
Corals
Stromatoporoids
Brachiopods
Causes:
Reduction of carbon dioxide
Global cooling
Posible asteroid impact
Permian
About 299 - 251 million years ago
Species affected: :
Rugose
Blastoids
Crinoids
Causes:
Poisoning of the seas
Poisoning of the atmosphere
Collision of asteroids
Intense volcanism
Triassic
About 251 - 199 million years ago
Species affected:
Gastropods
Pterosaurs
Bivalves
Causes:
Climate change
Volcanic eruptions
Global cooling
Asteroid impact
Cretaceous
About 145 - 66 million years ago
Species affected:
flying pterosaurs
mosasaurs
bivalves
Causes:
Asteroid impact
