System 



Oligocene 



sand and gravel 



Jurassic 



Permian 



Pennsylvanian 



Ordovician 



Cambrian 



Pre-Cambrian 



Kind of Rock 



Columnar 

 Section 



gray shale 

 limestone 



dark 



shale 



and 



sandy-shale 



red and buff 

 sandstone 



gray and buff 

 shale 



red and buff 



sandstone and 



shale 



red shale 

 and gypsum 



limestone and 

 red sands 



white sandstone 



gray to red 

 limey sandstone 



red shale 



gray 

 limestone 



pink limestone 



shale 

 sandstone 



schist, granite 



1 , 1,1 



r~o 



i . i . i 



i i i i 



i , i , r 



i i i 



FTT 



1111 



!' 1 ... I ,1 



Thickness 

 in Feet 



25-150 



1390 



325-590 



325 



500+ 



100-120 



500+ 



650 



80 



100-300 



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