Mass Extinctions
Ordovician:
Cretaceus
Date: 450 milion years ago
Devonian
Triassic
Permian
Extict species: its not that clear but around one hundred families were
extinguished that means around 85% earths fauna dissapear
Reasons: Decrease of sea levels and and extreme temperatures
Date: 146 to 66 milion years ago
Extinct species: All the dinosaurs
Reasons:Asteroid and high precence of iridium
Reason: Posoning of the seas and atmosphere by ash
Extinct species:90% of the surface on the earth was dead 7 out of 10 species in
the land extinct and 9 out of 10 marine species died
Date: 299-251 milion years ago
Extinct species: More than 70% of the marine organism
Reasons:Global cooling,loweing levels of carbon dioxide an possibly an
asteroid impact
Date: 416-359 million years ago
Extinct species:Dinosaurs but the ones that survived the jurassic era
Reasons:Gradual climate changes global cooling and an asteroid impact
Date: Date 251-199 million yaers ago
Made by: Esteban Cano