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GROUND WATER IN THE CENTRAL VALLEY, CALIFORNIA All <br />123 C 122 C 121'120 C 119 C 118 C <br />40' <br />39' <br />38' <br />37' <br />36' <br />35° ~ <br />EXPLANATION <br />LINE OF EQUAL THICKNESS OF CONTINENTAL DEPOSITS <br />Interval 1,000 feet <br />FIGURE 8. Thickness of Central Valley aquifer system (largely post-Eocene continental deposits). From Page (1974) and R.W. Page (U.S. <br />Geological Survey, written commun., 1981).