A Brief History of the Earth

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A Brief History of the Earth
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Timescale

• 7/8 of the entire period life has existed on
  earth is known as the Precambrian era.
• During this era, life was largely single celled,
  and prokaryotic.

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Other Eras
Following the Precambrian era came the Paleozoic,
Mesozoic, Cenozoic eras
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Cambrian Explosion

• At the beginning of the Paleozoic era, came the
  development of multicellularity. With this came
  an explosion of diverse life forms, only a few
  lines of these organisms would survive

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Cambrian species
Animaloracis
Trilobite
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Cambrian Organisms contd.
Opabinia
Sidneyia
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Our Distant Ancestor

• Pikaia, was the first animal known to posess a
  notochord, and is probably the ancestor to all
  vertebrates.

Pikaia
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Ordovichian
The Giant Orthocone
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Sea Scorpions
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A Canadian Timeline

• The following scenes represent the same location
  of northern Canada, separated only in time.

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Devonian period - 360 million years
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Dunkleosteus
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Permian period - 280 million years
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Jurassic period - 180 million years
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Lipleurodon
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Cymbospondylus
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Jurassic period - 140 million years
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Cretaceous period - 107 million years
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Cretaceous period - 75 million years
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Cretaceous period 72 million years
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A VERY Bad Day
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Another artists rendition of impact
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The Survivors
Some early mammals survived the cataclysm. These
would be the ancestors to all living
mammals. Mammals weren't the only survivors,
there was of course.
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TROGDOR!The Burninator
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Eocene period - 50 million years
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Eocene period - 50 million years
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Oligocene - 32 million years
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Miocene - 10 million years
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Pleistocene - 19,000 years ago