Geological Time Scale

EON ERA PERIOD EPOCH Branchiopods Malacostracans Ostracodes Barnacles

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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