Geological Time Scale

EON ERA PERIOD EPOCH Merostomates Arachnids

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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