736 



VICTOR ZIEGLER 



between these minor structures and the huge thrust faults here 

 described (Figs. 11-15). 



Minor Folds: Two distinct types of minor folds can be recog- 

 nized, folds en echelon and drag folds. The former pass practically 

 invariably on their west flank into eastward-dipping faults with 

 strikes nearly parallel to the axis of the fold. They represent 



Fig. 11. — Geological sketch map of area on Estes Park road west of Loveland, 

 showing characteristic fold en echelon and accompanying thrust fault. Section lines 

 are indicated. 



minor wrinkling, with overthrusts from the east subordinate in 

 amount to the main monoclinal uplift and faulting. Other folds, 

 noted especially in the shale series, represent adjustments by in- 

 competent layers to stresses incident to the formation of the 

 uplift. 



Minor Faults: Both strike and dip faults are numerous, espe- 

 cially in the structurally disturbed areas at Golden and Boulder. 

 They are all of slight displacement. They do not antedate the 



