ENDLicii.l GEOLOGICAL FORMATIONS OF COLORADO. 



THICKNESSES OF FORMATIONS AT CERTAIN LOCALITIES. 



131 



Locality. 



Groups. 



Thickness. 



White River and Grand 

 Animas River 



Trinidad. 

 Golden . . 



Mesa Verde 



Animas River 



White River 



Region of Rio Piedra , 

 Bear Canon 



Eagle River 



Pleasant Park 



Bear Canon 



Saint Vrain's Creek 



Unaweep Canon . 



Eagle River 



Canyon City 



Pleasant Park ... 



Gleu Eyrie 



Little Thompson . 



Eagle River 



Head of Salt Creek. 



Animas Region 



Park Range 



Elk Mountains 



Lime Creek. 



Eagle River 



Four Mile Creek 



North of Mount Ouray 



Glen Eyrie 



C Green River 

 I Wahsatch . . 

 Wahsatch 



Tertiary. 



Post- Cretaceous. 



( Pox Hills . 



< Colorado.. 

 ( Dakota . . . 

 C Fox Hills . 



< Colorado.. 

 (. Dakota . . . 

 ( Fox Hills. 



< Colorado. . 

 ( Dakota . . . 

 C Fox Hills . 

 ^ Colorado.. 

 ( Dakota . . . 

 f Fox Hills. 



< Colorado . . 

 (Dakota ... 



Cretaceous. 



Jura. 



Trias. 



Permian. 

 C Permian 



I Permo-carboniferous 



Carboniferous. 



C Upper Carhoniferous . 



< Middle Carboniferous. 

 ( Lower Carboniferous . 

 ( Upper Carboniferous . 



< Middle Carboniferous. 

 ( Lower Carboniferous . 

 C Upper Carboniferous . 



< Middle Carboniferous. 

 ( Lower Carboniferous . 

 C Upper Carboniferous . 



< Middle Carboniferous. 

 ( Lower Carboniferous . 



Devonian. 



f Trenton (?)., 



< Calciferous 



I Potsdam 



C Calcilerous 



I Potsdam — 



< Calciferous 



l Potsdam 



< Calciferous 

 ) Potsdam. .. 



Silurian. 



5300 

 2200 to 2C00 



2700 

 3200 



3500 to 4800 

 3400 

 3600 



3600 to 5000 

 750 



960 

 460 



870 

 450 



600 

 1000 

 1200 

 1500 

 1100 



750 



5500 



3100 



4300 to 4900 



4500 to 5000 



1200 to 1500 



770 



300 

 400 



Adding the thiclsness of all the sedimentary formations occurring in 

 Colorado, we arrive at the maximum result, giving a thickness of 24,500 

 feet. 



