o 

 o 



o 



o 





o 

 o 



Upper 

 Cretaceous 



Lower 

 Cretaceous 



Jurassic 



Triassic 



Permian 



Pennsylvanian 

 (Upper 

 Carboniferoiis) 



Mississippian 

 (Lower 

 Carboniferous) 



Devonian 



Silurian 



O 

 O 



Ordovician 



Cambrian 



