-
450 BCE
Ordovician
Trilobites -
450 BCE
Ordovician
Brachiopods -
450 BCE
Ordovician
Ophuiroids -
Period: 450 BCE to 430 BCE
Ordovician
Responsible for the extinction of 100 marine families. Before the extinction event, aquatic invertebrate were common such as trilobites and brachiopods. -
375 BCE
Devonian
Dunkleosteus -
375 BCE
Devonian
Tabulate Coral -
375 BCE
Devonian
Nautilus -
Period: 375 BCE to 360 BCE
Devonian
70 % of all marine species. Species in shallow oceans were affected the most, with coral reefs completely disappearing for 100 million years. -
262 BCE
Permian Triassic
Sponges -
262 BCE
Permian Triassic
Rugose Coral -
262 BCE
Permian Triassic
Crinoids -
Period: 262 BCE to 252 BCE
Permian-Triassic
Considered most deadly mass exctinction. 90% of all life died off. Caused by volcanism that may have been activated by a comet/asteroid. Resulted in an increased in freely swimming organisms in the oceans, rather than being attached to the ocean floor. -
252 BCE
End Triassic
Ammonoids -
252 BCE
End Triassic
Phytosaurs -
252 BCE
End Triassic
Aetosaurs -
Period: 252 BCE to 201 BCE
End Triassic
Caused by eruption of massive floods of lava which broke apart Pangea and formed Atlantic Ocean. Devastating for marine invertebrates, cleared way for larger reptiles such as dinosaurs. -
Period: 66 BCE to 65 BCE
End-Cretaceous
Caused by a several mile wide asteroid making impact with Earth's surface 18% of land vertebrate went extinct, including dinosaurs. Allowed for mammal takeover of the planet. -
65 BCE
End Cretaceous
Elasmosaurus -
65 BCE
End Cretaceous
Tyrannosaurus Rex and Ceratosaurus
