CONTENTS. 



Page. 



Letter op transmittal iii 



Preface v 



Table of contents xiii 



List of illustrations xxv 



List of atlas sheets xxvii 



Brief outline of results , xxix 



GEOLOGY. 



Chapter I. 



Leadville — Its position, discovery, and development 3 



Topograpbiciil description 3 



Routes of approach g 



Discovery of the precious metals , 7 



Development of mines 10 



Growth of the city 14 



Production 15 



Chapter II. 



Gkneral geology of the Mosquito Ea>ge 19 



Rocky Mountains in Colorado 19 



Eastern uplift 20 



The Parks 22 



Western uplift 23 



Mountain structure 24 



Mosquito Range — Topography 27 



Geological history 30 



Mineral deposition 33 



Structural results of the dynamic movements 34 



Displacement — Volcanic rocks 39 



General erosion — Arkansas Valley erosion 40 



Glacial erosion 41 



Stream erosion — Valleys 42 



XIII 



