Mass extinctions

600 million years ago-66 million years ago

Period: 601 BCE to 65 BCE

Ediatric period

600 BCE

around 600 million years ago was technically the first mass extinction killing all animals from a lack of oxygen. This might have been caused by anyth8nb natural disasters, asteroids etc.

Ordovician

443 BCE

443 million years ago. A huge majority of ocean life was washed out and the first plants to self survive got wiped out. A huge ice age occurs in the Southern Hemisphere creating a global cooling situation.

Late devonian

372 BCE

372 million years ago. The new land has been over taken by insects and many greens. The extinction was a little befor Pangea and really only effects ocean life such as massive coral reefs, Gondwana, and euramerica. Trees in this time period would be 100 feet tall. Many wildlife got stressed with hypothermic temperatures and oxygen deprivation causing extinction

Permian

252 BCE

252 million years ago. Just about all trees get wiped out, less then 5 percent of ocean life ends up living, and 90 percent of grass animals are completely gone. Global warming ends up taking place on the ocean floor and the animals were left not being able to breathe.

Triassic

201 BCE

201 million years ago. I believe an excess amount of CO2 begins to build and causes acid rain to create within the ocean killing 76 percent of all marine animals. This wiped out a few dinosaurs(not the entire species but a vast majority) such as the pterosaurs, plesiosaurs, and the ichthyosaurs

Cretaceous

66 BCE

66 million years ago. Before thousands of dinosaurs species were roaming the earth until a giant asteroid hit earth killing them all. Many believe a volcanic eruption caused this however I know it was an asteroid. Birds were really the only animals to survive.