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.

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Presentation Transcript

Timescale
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
Other Eras

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


Cambrian explosion
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
Cambrian species

Animaloracis

Trilobite


Cambrian organisms contd
Cambrian Organisms contd.

Opabinia

Sidneyia


Our distant ancestor
Our Distant Ancestor

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

Pikaia


Ordovichian
Ordovichian

The Giant Orthocone



A canadian timeline
A Canadian Timeline

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














The survivors
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
TROGDOR!The Burninator







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