it 



neralized Paleozoic Grand Canyon Section after Walcott (6, page 50). 



iation. 



imestone . 



|indstone . . . 



limestone . 



utte lime- 



ivon. 



Character. 



Shales and marls with impure 



limestones at base. 

 Massive cherty limestone pass- 



ino; into calciferous sandrock 



Reddish sandstone passing 

 into compact beds. 



Arenaceous and cherty lime- 

 stone with massive lime- 

 stone beneath. 



Impure limestone 



Calcareous and arenaceous 

 shales and sandstones. 



Shales and limestones. . 5,120 

 Sandstones with lava 



flows 6,830 



Bedded quartzite and 



schists 1,000 



Thickness. 



Feet. 

 854 



805 



1,485 



962 



94 



1,050 



1 

 1 

 J- 12,950 



Age. 



Permian. 



Carboniferous. 



Carboniferous. 



Carboniferous. 



Devonian. 



Cambrian. 



Algonkian. 



