5,000-1,500    (the earth forms and life begins)
1500-545
545-505
505-438
438-410
410-355
355-290
290-250
250-205         (dinosaurs arrive)
205-135
135-65           (dinosaurs die off)
65-55
55-38
38-26             (mammals abundant)
26-6
6-1.8
1.8-.01
.5-.25
.25-.06
.06-.01
.01-0




Cambrian
Ordovician
Silurian
Devonian
Carboniferous
Permian
Triassic
Jurassic
Cretaceous


Tertiary




Quarternary














Paleocene
Eocene
Oligocene
Miocene
Pliocene
Pleistocene
Lower Paleolithic
Middle
Paleolithic
Upper Paleolithic
Holocene
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Archaezoic    
Proterozoic            
                           

Paleozoic    




Mesozoic               
                                
                          



Cenozoic         
Era          Period      Epoch              Year
Geological Timeline