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200 mya
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The Jurassic Period started 199.6 mya and ended 145.5 mya.
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The Icthyosaurus began showing fossils in layers of rock of about this age
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The Atlantic Ocean first appears between Africa and North America when the super continent breaks apart, Evidence for this event include dinasaur fossils found in Africa and North America of dinasaurs who could not swim.
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An 80 km crater was created, and serious damage was done to the land and surrounding areas.
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Monotromes serpate into primitive animals at about this time.
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The Brachiosaurus is thought to have emerged at some point between the middle and end of the Jurassic period.
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The Patagosaurus is thought to have emerged at some point between the middle and end of the Jurassic period.
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The Diplodocus dinasour is thought to have first come into exsistence at this time or shortly after.
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The first evidence for the Stegosauras is this date. It is clear because of its distinct fossilized scales.
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Small birds first started having feathers and then wings, shortly followed by winged reptiles such as the Arcgaeopteryx (picture)
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Marsupials and eutherian mammals distinctly split at this time.
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146 mya
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This impact was slightly smaller leaving a 70 km crater.
