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A10 REGIONAL AQUIFER-SYSTEM ANALYSIS—CENTRAL VALLEY, CALIFORNIA <br /> deposits may be as much as 15,000 ft thick, but 5,000 ft { water flaw (described later) because (1) the total proba- <br /> is shown as the maximum aquifer system thickness (fig. I. ble volume affected is less than 1 percent of the total <br /> 8). The omission of all continental deposits beneath the volume of the aquifer system and (2) the deeper part of <br /> 9,000-foot level does not affect the analysis of ground- the continental deposits is so far below practical pumping <br /> Youngeo <br /> EXPLANATION r ` <br /> AREAS OF MARINE DEPOSITION � t <br /> DURING THE 7ER'[7ARY <br /> ti <br /> BOUNDARY OF CENTRAL VALLEY <br /> i Pliocene <br /> 7 <br /> r, l <br /> t 1 1 <br /> i !\ <br /> a Miocene <br /> l � \ <br /> 1 ` <br /> G � <br /> oligacene <br /> 0rdesr_ ` <br /> I <br /> Eocene <br /> , <br /> Paleocene <br /> FiGuRE 7.—Approximate areas of marine deposition during the Tertiary <br />