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A10 REGIONAL AQUIFER-SYSTEM ANALYSIS-CENTRAL VALLEY, CALIFORNIA <br />deposits may be as much as 15,000 ft thick, but 9,000 ft <br />is shown as the maximum aquifer system thickness (fig. <br />8). The omission of all continental deposits beneath the <br />9,000-foot level does not affect the analysis of ground- <br />water flow (described later) because (1) the total proba- <br />ble volume affected is less than 1 percent of the total <br />volume of the aquifer system and (2) the deeper part of <br />the continental deposits is so far below practical pumping <br />youngest <br />EXPLANATION <br />AREAS OF MARINE DEPOSITION <br />DURING THE TERTIARY <br />BOUNDARY OF CENTRAL VALLEY <br />Paleocene <br />FIGURE 7. Approximate areas of marine deposition during the Tertiary.