CONTENTS. vii 



Chapter II. — Mesozoic geology, '>> George II. Eldridge— Continued. Page. 

 Section II. — Structure — Continued. 

 The foothills — Continued. 



Region about Boulder — Continued. 



Geological feal ures tOS 



Development of tin- region 110 



Inferences from the scries of unconformities at Boulder and Golden Ill 



Region of Coal Creek Teak Ill' 



Surface features 112 



Structural relations of the formations 1 12 



Geological development of the area 113 



Region between Boulder unconformities and Coal ( 'reek Peak Ill 



The fault at tin' southern limit of tin- region of the Boulder unconformities. - . . Ill 



The fault of the South Boulder Peaks 115 



The fault in the foothills smith of South Boulder ( reek 119 



The Deer Creek fault 1 10 



The Plains 120 



The Boulder Valley region 120 



Introduction 120 



The system of folds 122 



The fault system [28 



Discussion of the general plains structure Ill 



The Boulder section 112 



The Davidson section 1 1:; 



The Ralston section Ml 



The Ralston, Green Mountain, and Bear ('reck sections ii."> 



The l'lu in Creek section 119 



Chapter III. — Post-Laramie ami Tertiarj geology ir, 1 



Section I. — Arapahoe formation, by i ieorge II. Eldridge ir,l 



Introduction ]-,i 



Stratigraphy i.-.o 



Lower division \yj 



Upper division I -,;; 



Life i;,4 



Distinguishing characteristics 154 



Strati graphical relations 154 



Section II. — Denver formation, by Whitman Cross I.y, 



Introduction [ 55 



I lescription of the formation 159 



The base of the series I Mi 



The strata of South Table Mountain li;i 



Exposures on North Table .Mountain 170 



Green Mountain 171 



The strata of the plains 170, 



The shore-line deposits is2 



Occurrence of the formation 1*4 



