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SIS—CEN RAL VAL EY, CALIF RNIA <br /> fro i ev s na 11 or <br /> of the cent an older Ce ozoic sed ments th t have <br /> been d posited in the valley <br /> Baile and othe (1970)d scribed t e significa ce and <br /> process s o t o over t sting of a esozoic <br /> marine sediments to the fo tion of a Coast anges <br /> and to t e defo tion of the Great Val ey sequen .Two <br /> import nt hydrol gic points can be a from ailey's <br /> geologi discussio . First, a emerg nee of th Coast <br /> Range st and subseque t develop ent of th Coast <br /> Ranges establish d an oro phie b er for in isture- <br /> laden o shore oc is win s• as a sult the entral <br /> Valley ffectively was put ' to a rain shadow si ce the <br /> formati n of its est bound —an i portant f ctor in <br /> eanside ng the s urce and istributio of groan -water <br /> emphas zed is th extensiv deformat on of the marine <br /> beds of he Great alley seq enee on t e west sid of the <br /> valley. n additio to estab' hing the ymmetri nature <br /> U d �, <br /> form a fault zon under t e west s de of th valley <br /> (Oakes ott,1971, 289).T e fault zon and the ds are <br /> barrie to group -water flo . Variati ns in the c emical <br /> qu 1 y of groan wa er a n in y u e s are <br /> obsery d in close spaced ells of s' filar cons ction <br /> drilled ear the ast boun ary of t e Coast angel <br /> (Hots ss and B ding, 197 }_ <br />