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Life on earth appeared about 3.85 billion years ago.
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The earth had begun about 4.5 billion years ago.
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439 million years ago about 86 % of life was wiped out. There was two major events happening that scientist believed were the cause of: glaciation, and falling sea levels.
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Around 364 million years ago devonian begun. 75% of species were lost. Volcanic ash was thought to be reasonable for cooling earths temp which killed spiders and scorpion- type creatures.
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Permian started 299 million years ago.
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The Triassic Period was the first period of the Mesozoic Era and occurred between 251 million and 199 million years ago. It followed the great mass extinction at the end of the Permian Period and was a time when life outside of the oceans began to diversify.
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The Cretaceous Period was the last and longest segment of the Mesozoic Era. It lasted approximately 79 million years, from the minor extinction event that closed the Jurassic Period about 145.5 million years ago to the Cretaceous-Paleogene (K-Pg) extinction event dated at 65.5 million years ago
