Smithsonian miscellaneous collection 





#:*:-«* I?. •%,. 









Lncontormable contact on line (.la) between Arcliean {I = \ i.hnu bcnes) and Vlgunkian (Un = 

 side ot view on line (An-). _ In ccnt.T an, I U-fl side on Iim /, the Cambrian (7) lests unconformal)l;i 

 Locality: North side ot (,iaiid (,ni\on of (oloi,,do i<u,,, \iizona, below Bright Angel Canyon, j 



One ot tlie finest (jf 

 J\Iuav limestone (.U) form terraces 



ght Angel Canyon, . 

 surface giaded by erosion across the 

 us Red Wall limestone (R). 



