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LEY, C IFORNIA A7 <br /> 1 - <br /> rth or sou of a bas line;the nge num er, east <br /> t of a me ' dian; and he section number. section <br /> ed into s teen 40- re tract lettered consecu- <br /> (exc u 1 an ), begmn g wi in e <br /> ast come of the se tion and rogressin to R in <br /> theast co er (fig. ). Within the 40-ac tract, <br /> segue tially n tiered in he order hey are <br /> ried. Th final lett r refers t the base fine and <br /> n relativ to which a towns ips and ges are <br /> red. For e Cen 1 Valley, this is th Mount <br /> base line nd me ri an (M). <br /> HYDROI GEOLOG <br /> Central alley is a long, n w, no hwest- <br /> g, asy etric st ctural tro gh that as been <br /> th abou 32,000 ft of sedim t in the outhern <br /> RANGE <br /> W 1E 2 3E <br />