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<br />~ <br />1:'-. <br />~ <br />N <br /> <br />CONTENTS <br /> <br />XI <br /> <br />c;, <br /> <br />Section <br /> <br />Pag~ <br /> <br />SITE B <br /> <br />~8 Location and descriptioo__ - - ______ ------- - - -- - n__ _n - -- - -- - ----- -- -- <br />59 Geologic features ____________________________________ n_____________ <br />60 Suounary ---------------------------------------------------------- <br />GAGING-STATION SITE <br />61 Location and descriptionn____n_____n___n_nn__+___hunn___nn_ 55 <br />62 Geologic features __nn_nn_______nn_nnnn__._n___nnnn_n_ 56 <br />63 Summary and conclusions __n__n___n_nnnn__. __nn_nnnn___ 56 <br /> <br />55 <br />55 <br />55 <br /> <br />UPPER C SITE <br />64 Location and description _____nn_n_____nnn_______nn_n____n_ 57 <br />65 Summary _________________________________________ ------------------ 57 <br /> <br />SITE C <br /> <br />66 Location and description n_____n___n_n___n_n_______nn_n_nnn 57 <br />67 Plan and extent of explorationnn______n__nn________nn_n__n__n 59 <br />68 Geologic section on line C-1 nn______nn___n_n_______n_nn_____n 62 <br />69 Drilling on line C_2_____n__n____n_nn_____n____________n_______ 62 <br />70 Geologic section on line D-200_nn___________n_n_______n_nn__nn 64 <br />71 Line 0-400 ___________________________n_n______ _________n_______ 6.5 <br />7]. Line U-200 __n_______________________________n_______n__n_______ 65 <br />73 Line U.300 _____________________________________.._______________-__ 67 <br />74 Geologic section on line U-400_n______________n________nnnn_nn 67 <br />7'5 Line U-500 _n________________n__n_______nn__u____nnn___nn 67 <br />76 Line U.600 nn_nnn____nnn________n__nn___________nn___n 67 <br />71 Cofferdam lines A and B__n__n____________nn_____n_____nnn___ 68 <br />78 Cofferdam line C ___n_nn__n___n______n______________nn_____ 69 <br />79 Test tunnels _______________________________________________________ 70 <br />80 Geologic features n________n_________________n_____________________ 70 <br />81 Report by board of consultants-nn__nn__n_nn__._____nnn_______ 72 <br />82 Report of Colorado River Board of November 1928_n____n___nnn_____ 73 <br /> <br />CHAPTER V-TOPOGRAPHY AND GEOLOGY <br />OF BLACK CANYON <br /> <br />TOPOGRAPHY <br />83 General features ________nn__n_______________n______n_n____nn_ 75 <br />84 Black Canyon _______________________________________________________ 75 <br />85 Development of existing surface features-n___nn_n____n___n_____n_ 79 <br /> <br />STRATIGRAPHY <br />86 Age and occurrence of Black Canyon rocks__n_nn________nnnnnn_ 82 <br />87 Relation of Black Canyon group to pre-Cambrian rocks____n__________n__ 84 <br />88 Summary _______ ____ _ ____ _ _ _______ ____ _ _ _ _ _ _ _____ _ __________ _ _ __ _ _.. 85 <br />CLASSIFICATION AND DESCRIPTION OF ROCKS <br />89 Introduction ____n _ _ __n_ _h _ _____ _ n___________________ _ _ n n _ _ __.. 85 <br /> <br />1. Altered Igneous Rocks <br />90 Desct1iption and distribution__________n___u_______~_____n___________. 87 <br />91~ Causes of alteratio[L_____n____________n_u_________~n_n_________n 88 <br />92 Relation to other formations_______h______nn___n_____hn_________n 88 <br />