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<br />r- <br />C""; <br />~ <br />C'-J <br /> <br />c <br /> <br />XII <br /> <br />CONTENTS <br /> <br />Section <br /> <br />2. Older Volcanh Series <br />93 General description and distribution_____________________n_____n_______ <br />94 Dam Breccia ___________n_____nh_______n_____hn__nn______n__ <br />1. Distribution and relation to other formations__n__nn_nnnn_____n <br />2. Thickness _________ _ _____ _ _ _ _ __ _____ __ _ __ _ _ _ ____ _ __ _ __ _ ___ _ ___ __ __ <br />3. Density and strength_n____________n_n__nn__.___n_nnn__n__ <br /> <br />3. Younger Volcanic Series <br />95 General descrip~ion _ ____ - ___n_ ___ _ _n _ _ n_n _ _ __ _. _ ___ _n n__ ___ _ _ __ <br />96 Latite flow-breccia _nn_____n_____nn__nn__________________n____ <br />1. Distribution. thickness, and relation to the projectn_._nnn__nn_nn <br />2. Petrographic determination _____nn____n__n_______n__n_____h__ <br />3. Hardness and stability h____h__h___h_________.h__h__h_h__n_ <br />4. Strength and elastic propertiesh____hnn_hn____U_nn________h_ <br />97 Intrusive latite _n___hnn______n_nn____n____n________________ <br />98 Isolated sediments _n h_ n _ __ _ nn _ __ _ _ __ ____ _ _ n__ _ _ __ _ ____h ____n_ <br />99 Spillway Breccia n___nn___n___h_h__h_____h____n__hnh______ <br />100 Basic latite ___h___________h___nh__________________n_____h___ <br /> <br />101 Tuff __n___ ______ _ _ __n _ _n n___ ___n___ ____ n_,n ___ __n______n_ <br />102 Biotite latite n_____h_h__________h_____________h_h____h___n__ <br />103 Dry Camp Brecciah__n____n_____hn____u_n_____nhh____n___ <br />104 Basalt (trachydolerite) __h_____hn_n___n_h___._hh___nn______ <br />1. Distribution and relation to the project_nhn_h__hnn___nnnn <br />2. Petrographic character ______________n____n____n_n_hn___n__ <br />3. Chemical composition h_h______h__nh___n____n_____h___n__ <br />4. .Age and succession ___________________________..-nnn___u_un_ <br />5. Compressive strength and elastic propertieLn_u____u____uuu___u_ <br /> <br />CHAPTER VI-STRUCTURAL GEOLOGY OF BLACK CANYON <br />105 Introduction _nuu___u_h_uhn___n_hU_n__Uu_un___n____ 103 <br />106 Blac/.: Canyon crustal block __nnn___nnn___u___n_n_unnn__ 103 <br />107 Internal structure ____u_n_____nunu_nunu_ Uh__Uh__u_n_ 104 <br />108 General description of faultL_u_n__nn_u___h__ __U_h__h_h_U_ 105 <br />109 Attitude of formationsh__n____u__hn___u__h___uu__un___uu 106 <br />110 Dip of faults n___nn_n___nun__un_____h_ u_uu___n______ 106 <br />111 Magnitude of movement n___n____nu__nuu__.___h___hn__hh_ 106 <br />112 Character of fault zones________n_________________n____h__U______ 107 <br />113 Origin of the canyon_n_________n______n________h__U___________ 108 <br />114 Location of dam in reference to faultsn_n_n_hh__.___uuh_n_hh_ 109 <br />115 Periods of diastrophism according to stratigraphic evidence______h_n____ 111 <br />116 Causes of faulting h__________uu___n_Uh______u_____Uh__U__ 113 <br />117 Other structural featuresu__nuh___nu_n___h__uh_un___uu_ 114 <br />118 RelaUion to regional structure__u____u_______u____.____u____________ 114 <br />119 Future stability of the region__u____uuh__nh___ _UUhnnuU_n 115 <br />120 Effect of reservoir storage_h_u____nn______________n_____n______ 116 <br /> <br />CHAPTER VII-EXPLORATIONS IN BLACK CANYON <br />INTRODUCTION <br />121 General description _____n___n______n____nn_________________n_ 119 <br />122 General characteristics of granitic and volcanic rocksn__n____________h 119 <br /> <br />Pag~ <br /> <br />88 <br />89 <br />90 <br />90 <br />91 <br /> <br />92 <br />92 <br />93 <br />93 <br />93 <br />94 <br />94 <br />95 <br />95 <br />96 <br />97 <br />97 <br />99 <br />99 <br />99 <br />100 <br />101 <br />101 <br />102 <br />