Geological Time Scale

EON ERA PERIOD EPOCH Stylophorans Homoiosostelids Homostelids Ctenocystoids

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        

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