Geological Time Scale

EON ERA PERIOD EPOCH Archaeogastropods Mesogastropods Neogastropods

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

Major molluscan groups Back to Molluscs