Downloaded 41 times
More Related Content
Similar to Mass Extinctions
Mass Extinctions
- 1.
- 2. Mass Extinctions • Widespreadand rapid decrease in the amount of life in the Earth • Occurs when the rate of extinction is increased with the respect to the rate of speciation
- 3. Great Oxygenation Event •Also called as Oxygen Catastrophe • 2.3 Billion years ago • Biologically induced appearance of dioxygen in Earth’s atmosphere • Kills anaerobic organisms • First major mass extinction that happened in history
- 4. End-Ediacaran Extinction • 542Million Years Ago • Mass extinction of Acritarchs • Disappearance of Ediacaran Biota, most common organisms living in the Ediacaran period
- 7. Ordovician-Silurian Extinction • 450-439Million Years Ago • Second largest mass extinction in Earth’s history • Dropping of sea level due to the formation of glaciers • 49% of marine genera went extinct
- 8. Late Devonian Extinction •375-360 Million Years Ago • Caused by widespread anoxia in ocean waters or global cooling • 50% of all genera went extinct • Marine organisms were affected
- 9. Permian-Triassic Extinction • GreatDying • 252 Million Years Ago • Worst mass extinction in Earth’s history • 96% of all marine species went extinct and 70% of all terrestrial species went extinct • Caused by volcanism, asteroid impact or breaking-up of the supercontinent Pangaea
- 10. Triassic-Jurassic Extinction • LateTriassic Extinction • 201.3 Million Years Ago • 34% of all marine genera went extinct • Crocodylomorphs and other land species also went extinct • Caused by global climate change, asteroid impact or volcanism
- 11.
- 12. Central Atlantic MagmaticProvince
- 13. Cretaceous-Tertiary Extinction • K-TMass Extinction • 65 Million Years Ago • 75% of all land and marine species went extinct • Famously for killing the dinosaurs • Asteroid impact and volcanism
- 14.
- 15.