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<br />~ <br />:"") <br />-:r <br />N <br /> <br />o <br /> <br />CONTENTS <br /> <br />Section <br />Introductory statement __n __ _ _ n_ _______ - -- -- - -- --. - - - - - - - - - - - - - -- <br />Engineering organization during construction ---------~--------------- <br />Fore~ord _______________________________________._______________ <br />Contents ______ - _ ----------- --- - - --- - ----- - -- - -- ------------ --- -- <br />List of figures___________ _n _____ - - -- -- - - - ---- -- - --. - - - - - - -- - ------ <br />List of tables__ _ __ ____ n_ -- --- - ---- -- -- - -- --------.-- -- -- - - - - -- - -- <br /> <br />Page <br />II <br />VI <br />VII <br />IX <br />XVI <br />XVIIl <br /> <br />CHAPTER I-INTRODUCTION AND SUMMARY <br />INTRODUCTION <br />1 Preliminary statement _______________________________________________ 1 <br />2 Purpose of the investigations _n_______________n____n______n___.____ 1 <br />3 Prior geological surveys _n____________n______n____________________ 2 <br />4 Prior storage investigations__h_n____n____________n________________ 3 <br />5 Extent and character of ,Boulder Canyon project investigation5-__h__._______ 4 <br />6 Personnel ____________________________________________._ ____________ 4 <br />7 Scope and purpose of bulletin on geology___nhh_______n_hn__n_n 6 <br />8 Importance of geological investigations-_________________n___h____~.__ 6 <br />9 General procedure ___________________________________________________ 7 <br />to Duties and responsibilities of the geologisL_nn_hu___________n_n____ 7 <br />11 Methods used in making the geological surveys-___h_____h__n___h_._n 8 <br />12 Methods of exploration_____h__n_______n_____n____________________ 9 <br /> <br />SUMMARY <br />13 Investigations in Boulder Canyon_nn__h_h_nh___ n_n__hh_______ 9 <br />14 Black Canyon investi.gations__n__h____________nu____n____n_______ 10 <br />IS Report on problems of the Colorado RiveL______________n_____________ 10 <br />16 Colorado River Board report of November 1928__h_______n__n__n____ 11 <br />17 The Boulder Canyon Project ACL_nn_h_h_____n__n__n_nn_n____ 13 <br />18 Colorado River Board Report of November 1932_____..n______h___n___ 13 <br /> <br />CHAPTER II-REGIONAL GEOLOGY <br />GEOGRAPHIC PEA TURES <br /> <br />19 Location <br />20 Principal <br />21 Climate <br /> <br />topographic featureL__n _ _ _______ _ _ _ ___ ____ _ _ _________ __ _ _ ___ <br /> <br />15 <br />1j <br />19 <br /> <br />GENERAL GEOLOGY <br />22 Principal sources of information__n_________n______._______h_________ 20 <br />23 General geology of the region__n__h_________n________________h____ 20 <br />24 Geologic features of the reservoir site___n__n___h__________h________ 30 <br /> <br />IX <br />