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Earth is Formed
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Period: to
History of the Earth
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Phanerazoic Eon Begins
540 Million -
Paleozoic Era Begins
540 Million Years Ago
7 Periods within
Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian -
End Ordovician Extinction (1st)
444 Million Years Ago - Caused by short Ice-age - 86% of species died -
Late Devonian Exinction (2nd)
375 Million years ago - caused by land plants releasing nutrients into oceans - 75% died -
End Permian Extinction (3rd)
251 million years ago - Caused by climate change after volcanic eruption and bacteria producing methane - 96% of species dead -
Mesozoic Era Begina
245 Million Years Ago
3 Periods within Triassic, Jurassic, Cretacous
Age of Reptiles - Dinosaurs, snakes, crocodillians, turtles, etc. -
End Triassic Extinction(4th)
200 Million years ago - caused by unknown reasons - 80% of species died off -
End Cretaceous Extinction(5th) 66 million years ago, 76% of all species lost
66 Million Years ago - caused by asteroid impact, after climate change had been going on - 76% of all species died -
Cenozoic Era Begins
65 Million years ago
2 periods within Tertiary, Quaternary
Age of Mammals - Humans, deer, cats, rhinos, elephants, etc. -
Present Day
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Holocene Extinction(6th)
Present Day - Caused by human activity leading to habitat loss and man-made climate change, resulting in many species dying or being killed off, at an ever increasing rate -
Citations
-Enchantedlearning.com,. "GEOLOGIC EONS, ERAS And PERIODS - Paleontology And Geology Glossary". N.p., 2006. Web. 4 Feb. 2016.
-Cotf.edu,. "Earth Floor: Geologic Time". N.p., 2007. Web. 4 Feb. 2016.
-Murcia, Jaime. "The Big Five Extinctions". Cosmos Magazine. N.p., 2015. Web. 4 Feb. 2016.
