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<br />d:J <br />.' <br />,~ <br />C'1 <br /> <br />o <br /> <br />CONTENTS <br /> <br />XIII <br /> <br />Slction <br /> <br />UPPER BLACK CANYON SITE <br /> <br />Page <br /> <br />123 General description _u_________n_u______n_____ _n______u_______ 121 <br />124 Results of drilling _nnn_n___n_nnnn_n______n_n__nnnn__ 121 <br />125 Interpretation of data, and conc1usionLnnnnn_n_____nnn__nn_n 123 <br /> <br />LOWER BLACK CANYON SITE <br />126 Summary of exploratory workn_n__n_n_n___n_-.___n_nn_n_nn 123 <br />127 Plan of drilling ________n___n_n_nnnn_nn____unn___nn_n 124 <br />128 Geologic section on line D n___n__n_______un__.__nnnnn__nn 128 <br />129 Geologic section on line D-200_nn_nn___n_nn_ nnn__n_nn_n 128 <br />130 Geologic section on line ,0.400_____________________ ___nn_____unn_ 129 <br />131 Geologic section on line D-600n___n___nn___n_. _nn_n_nnn_n 129 <br />132 Geologic section on line D_IO{)On__n___n_n__nnnnn_nn_n_n_ 131 <br />133 Geolo.gic section on line U_200__n_n_nn____nn_ __n__nn__nnn 131 <br />134 Geologic sect~on on line U~940_nn_u_nu__n____ ______nn__nnu 133 <br />135 Deep boring D_107,E_2L__u__n_n____nnu_n_ nunnn_un___ 133 <br />136 Abutment boring D_56,E_49___n_u____n__un_n_______h__nn___n 135 <br />137 Abutment boring D_130.2,W_356.5nnnun_uu____n_n_nnunnn 135 <br />138 Test twmels in abutmentsn___nnn_u_n_n_n__ nnnn____u__n 137 <br />139 Geologic section on line U_1240_nn_nu___nn___ nnnnn_nn_n 137 <br /> <br />MATERIALS FOR CONSTRUCTION <br />140 Introduction _____n______________n_____n___n___________n_______ 138 <br />141 Arizona gravel deposit nn_u_un__nnnn_nn__nnn_nn_u_h_ 138 <br /> <br />CHAPTER VIII-THE ALLUVIAL FILL AND <br />THE CANYON FLOOR <br /> <br />142 <br />143 <br />144 <br />145 <br />146 <br />147 <br /> <br />CHARACTER OF THE ALLUVIAL FILL <br />General description __u___n_n__________u___n__ __nn____n______ <br />Origin and movement of alluvium______nnuu____ nuu____________ <br />Sand lenses _______________________________________________________ <br />Degree of consolidation_____h___ _ _ n__ _ n_ ___n _ _ __ __ _ __ nhnn___ <br />Lithology _________________________________________________________ <br />Petrographic character _ _ n _ _ _ n _ ___n__ hn _ _ _ _ n ____n___ _ _ _n______ <br /> <br />143 <br />145 <br />146 <br />146 <br />147 <br />149 <br /> <br />148 <br />149 <br />150 <br />151 <br /> <br />SCOUR DURING FLOODS <br />Gage height and discharge_________n_nn_________._n_______h______ <br />The buried plank as evidence of SCOUf__________h______________________ <br />Flood velocity hn________h_nnn _ _ _ _n _ _ ____ _ _ _ _ _ ____ _ __ _h ___n <br />Scour on the basis of computed floods hnn_hh____nnu_____nnu <br /> <br />150 <br />150 <br />152 <br />152 <br /> <br />152 <br />153 <br />154 <br />155 <br />156 <br /> <br />FEATURES OF THE CANYON FLOOR <br />The inner gorge_ _hh _ _ _ _ n __ nn___ __n ___ _h _ _"_ _ _ ___ __n_h _ __ _ __ <br />Rills and potholes of the inner gorge____nnnnn_____n_n_nnn_u <br /> <br />~c;'~in t::at~: i~~~;~-o~~~============ === == = == =====~~ = === === ======== === <br /> <br />Cleavage __ _ _________ ____ __ __ _ _ _ ___ _ _ ___ __ ______ _ _ _ __ _ ___ __ _ ______ <br /> <br />154 <br />156 <br />158 <br />159 <br />164 <br />