Geological Time Scale

EON ERA PERIOD EPOCH Trilobites Chelicerates Uniramians Crustaceans

P
H
A
N
E
R
O
Z
O
I
C

C
e
n
o
z
o
i
c
Neogene Holocene      
Pleistocene      
Pliocene      
Miocene      
Paleogene Oligocene      
Eocene      
Paleocene      
M
e
s
o
z
o
i
c
Cretaceous      
Jurassic      
Triassic      
P
a
l
e
o
z
o
i
c
Permian        
Pennsylvanian        
Mississippian        
Devonian        
Silurian        
Ordovician        
Cambrian        

Proterozoic

Archaen

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