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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. - PowerPoint PPT Presentation
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A Brief History of the A Brief History of the EarthEarth
TimescaleTimescale• 7/8 of the entire period life has existed on 7/8 of the entire period life has existed on
earth is known as the Precambrian era.earth is known as the Precambrian era.• During this era, life was largely single During this era, life was largely single
celled, and prokaryotic.celled, and prokaryotic.
Other ErasOther ErasFollowing the Following the Precambrian Precambrian era came the era came the Paleozoic,Paleozoic, MesozoicMesozoic, & , & CenozoicCenozoic eras eras
Cambrian ExplosionCambrian Explosion• At the beginning of At the beginning of
the the PaleozoicPaleozoic era, era, came the came the development of development of multicellularity. With multicellularity. With this came an this came an explosion of diverse explosion of diverse life forms, only a few life forms, only a few lines of these lines of these organisms would organisms would survive…survive…
Cambrian speciesCambrian species
TrilobiteTrilobite
AnimaloracisAnimaloracis
Cambrian Organisms contdCambrian Organisms contd..
SidneyiaSidneyiaOpabiniaOpabinia
Our Distant AncestorOur Distant Ancestor• PikaiaPikaia, was the first animal known to , was the first animal known to
posess a notochord, and is probably the posess a notochord, and is probably the ancestor to all vertebrates.ancestor to all vertebrates.
PikaiaPikaia
OrdovichianOrdovichian
The Giant OrthoconeThe Giant Orthocone
Sea ScorpionsSea Scorpions
A Canadian TimelineA Canadian Timeline• The following scenes represent the The following scenes represent the
same location of northern Canada, same location of northern Canada, separated only in time.separated only in time.
Devonian period - 360 million Devonian period - 360 million yearsyears
DunkleosteusDunkleosteus
Permian period - 280 million yearsPermian period - 280 million years
Jurassic period - 180 million yearsJurassic period - 180 million years
LipleurodonLipleurodon
CymbospondylusCymbospondylus
Jurassic period - 140 million yearsJurassic period - 140 million years
Cretaceous period - 107 million Cretaceous period - 107 million yearsyears
Cretaceous period - 75 million Cretaceous period - 75 million yearsyears
Cretaceous period 72 million Cretaceous period 72 million yearsyears
A VERY Bad DayA VERY Bad Day
Another artist’s rendition of impactAnother artist’s rendition of impact
The SurvivorsThe Survivors
Some early mammals survived the cataclysm.Some early mammals survived the cataclysm.These would be the ancestors to all living mammals.These would be the ancestors to all living mammals.Mammals weren't the only survivors, there was of Mammals weren't the only survivors, there was of course….course….
TROGDOR!TROGDOR!The BurninatorThe Burninator
Eocene period - 50 million yearsEocene period - 50 million years
Eocene period - 50 million yearsEocene period - 50 million years
Oligocene - 32 million yearsOligocene - 32 million years
Miocene - 10 million yearsMiocene - 10 million years
Pleistocene - 19,000 years agoPleistocene - 19,000 years ago
