Geologic Time Scale Summary
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Transcript of Geologic Time Scale Summary
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Geologic Time Scale Summary
Precambrian - Cenezoic4.6 Billion Years - Today
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Learning TargetsBecome familiar with the Geologic
Time periodsLearn the major events that
happened in each period
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Precambrian4.6 billion years ago - about 550
million years ago (formation of Earth)
No life on landFossil bacteria and algaeCrust becomes solid Oxygen in atmosphere
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Paleozoic EraAbout 550 mya -
250 myaAge of
invertebrates“Paleo” = ancient,
“zoic” = lifeWarmer
temperatures in North America, Appalachian Mts. form
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Cambrian Period550 mya - 490
myaCambrian
explosionFirst great
expansion of sea life
Burgess Shale
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Ordovician period490 mya -
440 myaJawless fishFirst land
plantsEnds in mass
extinctionHagfish
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Silurian Period440 mya - 408 myaFirst jawed fishInsects like millipedes and centipedes First vascular plants on land
All plants we know today besides algae and fungi
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Devonian Period408 mya - 360
myaAge of Fish -->
Fish and land plants become very diverse
First sharks appear
Non-winged insects move to land
Tetrapods move to land near end
Late Mass extinction
Dunkleosteus
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Carboniferous Period360 mya - 280 myaCan be split into
Mississippian and Pennsylvanian periods
First insects with wings
First reptilesCockroaches first
appearWide spread Coal
Swamps
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Permian Period
280 mya - 248 mya
Age of Amphibians
Continents merge into Pangea
Largest ever extinction ends the Permian
MASS EXTINCTION GRAPH
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DINOSAURS!!!
Dimetrodon
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Therapsid
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Mesozoic Era250 mya - 65 mya“Age of Reptiles” aka “Age of
Dinosaurs”“Meso” = middle “Zoic” = life3 Time periods --> Triassic,
Jurassic, Cretaceous
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Triassic Period250 mya - 208 myaFirst dinosaurs,
mammals, and crocodyloforms
Ends with a mass extinction
Extinction allows dinosaurs to fill niches and diversify
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Jurassic Period208 mya - 146 myaLots of dinosaurs including
sauropodsFirst flowering plantsPangea breaks apart
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Cretaceous Period146 mya - 65 myaDinosaurs rule the
earthFirst crocodiles,
ants, bees, snakesFeathered
dinosaurs appearK/T mass extinction
--> no more dinosaurs or pterosaurs
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Cenozoic Era65 mya - ??????“Age of Mammals”
Could be age of birds, flowering plants or insects
Ceno = new zoic = life2 time periods --> Tertiary and
Quaternary
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Tertiary Period65 mya - 1.8 myaMammals abound Primitive primatesHorses, whales, pigs,
deerGrasses commonMegalodon
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Quaternary Period1.8 mya - ????Ice AgesLarge mammals
like mammoths, mastadons, sabertooths, giant sloths
First Homo sapiensMr. Wirth was born
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Macrauchenia stood at five feet tall, at a length of ten feet
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