# data[].attributes.body
4600 MYA ; Precambrian (Hadean, Archean, & Proterozoic Ages)
-no life form possible

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540 MYA ; Cambrian
-explosion of life
-all existing phyla came into being here
-life forms in warm seas as oxygen levels rose enough to support life
-dominant animals: trilobites and brachiopods

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490 MYA ; Ordovician
-first animals with bones appear
-dominant animal; marine
invertebrates including corals and trilobites

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443 MYA ; Silurian
-extensive erosion
-first land plants appear, and land animals follow

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417 MYA ; Devonian
-domiant animals: fish
-amphibians, evergreens, and ferns appear

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354 MYA ; Mississippian
-first seed plants appear
-sea life flourishes including
. coral
. brachiopods
. blastoids
. bryozoa

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320 MYA ; Pennsylvanian
-great swamps develop
-reptiles develop from amphibians
-flying insects appear

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290 MYA ; Permian
-pangea forms
-appalachians rise
-90% of earth's species become extinct, including trilobites, blastoids, fish and amphibians because of heavy volcanism in siberia

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248 MYA ; Triassic
-pangea begins to break
-rocky mountains & Sierra Nevada form
-first dinosaurs, mammals, and modern echinoids appear

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206 MYA ; Jurassic
-North America continues to rotate away from Africa
-first birds appear
-golden age of dinosaurs

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144 MYA ; Cretaceous
-mass extinction occurs at the end of the period caused by a meteorite impact (Dinosaurs, ammonites, and 25% of marine life become extinct)
-T-rex develops but number of dinosaur species decline
-snakes appear and first primates appear
-angiosperms appear

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65.0 MYA ; Paleocene
-first horses appear (size of cat)
-tropical plants dominate

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54.8 MYA ;  Eocene
-sea levels rise; deposits of marine sediments- limestone in S.C; land bridges form
-grass spreads widely
-diverse array of animals develop, including whales, rhinos, and elephants

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33.7 MYA ; Oligocene
-appalachians uplift; erosion increases
-cats, dogs, and apes appear

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23.8 MYA ; Miocene
-horses, mastadons, mammoths, tigers, and camels live in South Carolina

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5.3 MYA ; Pliocene
-volcanic activity in North America & Africa
-Grand Canyon forms
-hominoids develop

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1.8 MYA ; Pleistocene
-ice sheets form
-modern humans develop

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0.01 MYA ; Holocene
-beaches and barrier islands form
-mastadons become extinct
-human culture flourishes
-accelerating extinction of many species