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1 BYA
1.1 BYA
1.2 BYA
1.3 BYA
1.4 BYA
1.5 BYA
1.6 BYA
1.7 BYA
1.8 BYA
1.9 BYA
2 BYA
2.1 BYA
2.2 BYA
2.3 BYA
2.4 BYA
2.5 BYA
2.6 BYA
2.7 BYA
2.8 BYA
2.9 BYA
3 BYA
3.1 BYA
3.2 BYA
3.3 BYA
3.4 BYA
3.5 BYA
3.6 BYA
3.7 BYA
3.8 BYA
3.9 BYA
4 BYA
4.1 BYA
4.2 BYA
4.3 BYA
4.4 BYA
4.5 BYA
|
Present Day 
Recent Ice Ages Begin
Gigantopithecus
Homo habilis, Smilodon
Australopithecus "Lucy"
Earliest Mammoths
N. & S. American Land Bridge
forms / Mediterranean floods
Blue Whale appears
Giant Ground Sloth
First Hominids appear
Megalodon
Antarctic Ice Cap forms
First Monkeys
Alps Rise
Glacial Ages in South
Mississippi River forms
Primates split into 2 groups
Antarctica & Australia Separate
Himalayan Mts. form
First bats & Eohippus
Meteor impact creates
Chesapeake Bay
N. Atlantic Volcanic Activity
Rocky Mts. Form
K-T Extinction Event
Triceratops/T. rex!
Dryptosaurus
Hadrosaurus!
Velociraptor
Flowering plants dominate
Modern sharks appear
First flowering plants appear
Archaeopteryx
Allosaurus/Apatosaurus
Stegosaurus
Coniferous forests peak
Ginkgos appear
Pangaea begins breaking up
Atlantic ocean born!
Eastern N. American volcanic
activity ends.
Eastern N. American volcanic
activity begins.
Newark Supergroup forms
Primitive crocodiles appear
Coelophysis/Dilophosaurus
Manicouagan impact site
First Conifers
First "True" mammals appear
First dinosaurs, bees & ferns
Continents move together!
Mass Extinction!
Mammal-like reptiles appear
Dimetrodon
First beetles appear
Alleghenian Orogeny
First cycads
First egg-laying reptiles
and winged insects
First sharks
First plants w/roots
Extensive coal deposits form (PA)
Amphibians move onto land
Glacial period in Gondwana
- (S. Hemisphere)
Appalachians form
Acadian Orogeny ends
Plants surge onto the land
Acadian Orogeny begins
First jawed fish appear
Insects move onto the land
Earliest land plants (psilopsids)
First fish appear (jawless)
Taconic Orogeny
First shellfish
Earliest chordates
Burgess shale created!
Trilobites appear
Oxygen reaches present levels
Supercontinent forms
400 day year
Worldwide glacial period
Soft-bodied marine invertebrates
Zoophytes appear
First multi-celled organisms
Protozoans abundant
First evidence of cell division
Grenville Orogeny
Supercontinent
First multicellular algae
First Eukaryotic cells
Last banded iron formations
Hudsonian Orogeny
Supercontinent
End of iron formation
Supercontinent
Major banded iron formation
starts
Widespread glaciation
Stromatolites reign as
most visible life form
Oxygen build-ups in atmosphere
Kenoran Orogeny
Supercontinent
Earliest definite evidence of
cellular life
Tidal & monthly cycles stabilize
500 days per year
Laurentian Orogeny
Lichen-like slimes!
Uivakian Orogeny
Microfossil sites found in
Australia and Swaziland may be
single-celled bacteria
Possible evidence of
fossil algea
Cell-like inclusions found
in rocks in Greenland
Atmosphere & Hydrosphere
begin to form
Theoretical time of the
formation of the first cells!
Acasta Gniess - Canada
Earth molten at this time.
Proto-earth may have formed
100 million years earlier! |
PERIODS
QUATERNARY
-----------------------
TERTIARY
TERTIARY
-----------------------
CRETACEOUS
CRETACEOUS
-----------------------
JURASSIC
JURASSIC
-----------------------
TRIASSIC
TRIASSIC
-----------------------
PERMIAN
PERMIAN
-----------------------
CARBONIFEROUS
Pennsylvanian
Pennsylvanian
-----------------------
Mississippian
Mississippian
CARBONIFEROUS
-----------------------
DEVONIAN
DEVONIAN
-----------------------
SILURIAN
SILURIAN
-----------------------
ORDOVICIAN
ORDOVICIAN
-----------------------
|
