Name: Ordovician Extinction

When: 443.8 MYA (Million Years Ago)

Cause: Rapid Changes in Marine Oxygen Levels

Name: Late Devonian Extinction

When: 374 MYA

Cause: Changes in Sea Level and Ocean Anoxia, Possibly Triggered by Global Cooling or Volcanism.

Name: End Permian Extinction

When: 250 MYA

Cause: Warming of the Earth's Climate and Associated Changes to Oceans

Name: Triassic Jurassic Extinction

When: 252 MYA

Cause: The Slow Splitting of Pangea Caused Volcanoes to Form in the Central Atlantic Magmatic Province.

Name: End Cretaceous

When: 66 million MYA

Cause: The Chicxulub Asteroid

Name: TBD

When: Now

Cause: Global Warming/Climate Change, Pollution