A brief history of the earth
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A Brief History of the Earth PowerPoint PPT Presentation


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A Brief History of the Earth. 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. Other Eras. Following the Precambrian era came the Paleozoic, Mesozoic , & Cenozoic eras.

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A Brief History of the Earth

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A Brief History of the Earth


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.


Other Eras

Following the Precambrian era came the Paleozoic,Mesozoic, & Cenozoic eras


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…


Cambrian species

Animaloracis

Trilobite


Cambrian Organisms contd.

Opabinia

Sidneyia


Our Distant Ancestor

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

Pikaia


Ordovichian

The Giant Orthocone


Sea Scorpions


A Canadian Timeline

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


Devonian period - 360 million years


Dunkleosteus


Permian period - 280 million years


Jurassic period - 180 million years


Lipleurodon


Cymbospondylus


Jurassic period - 140 million years


Cretaceous period - 107 million years


Cretaceous period - 75 million years


Cretaceous period 72 million years


A VERY Bad Day


Another artist’s rendition of impact


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….


TROGDOR!The Burninator


Eocene period - 50 million years


Eocene period - 50 million years


Oligocene - 32 million years


Miocene - 10 million years


Pleistocene - 19,000 years ago


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