APPENDIX. 

 Section in West Central Colorado — Continued. 



571 



Names of Formations. 



Thickness 

 in Feet. 



Characteristics. 



<»'& "i Leadville limestone. 



^ m [ 



^ .4 ppnrent unconformity - 



no 2 



6° 





Yule limestone. 



400-525 



350-450 



The upper third massive, blue, and cavernous; 

 the lower two thirds bedded, gray to brown; 

 dark cherts. 



80 feet of green, pink, and yellow shale and 

 thin limestone at top; middle portion mas- 

 sive gray limestone with white chert. 



Sawatch quartzite. 



Unconformity 



■ Archean. 



50-350 



Upper two thirds red quartzite, containing 

 glauconite. The lower third quartzite with 

 conglomerate at base. 



Granite, gneiss, and schist. 



Strata folded, faulted, and cut by igneous intrusions. 



