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Plate 4 in which no significant abrupt decrease in sand or <br /> ' gravel beds is evident in the Stockton area. In fact , on the <br /> section, wells dust west of El Dorado Street indicate a local <br /> ' increase in gravel in the Laguna formation. <br /> While deposited sediments normally are progressively <br /> wfiner grained from source to place of farthest transit ( from <br /> ' the Sierras to the Delta) there is generally no sharp break <br /> in sediment grain size unless an impediment exists which <br /> x <br /> ' blocks orderly deposition. This impediment may be a fault , ? <br /> a topographic warp, a change in grade , or a change in x <br /> ' environment (say from fresh water to saline water conditions ) . <br /> Furthermore , this impediment would have to exist over a r <br /> significant vertical interval to be of importance in a ground <br /> water basin. I[ <br /> None of these situations appears applicable to the t <br /> ' Stockton area. The absence of faulting is indicated by <br /> ' Figure 6 . The absence of buried topographic warping is y <br /> suggested by the undistorted configuration of ground water f <br /> contours . The lack of change in grade or environment is .c <br /> indicated by the westward extension of sediments without <br /> noticeable interruption and by the known continental nature <br /> ' of the sediments . In addition to these , there is no <br /> indication of a barrier at other places in the Delta ( 37 ) , <br /> Plates 3 , 4 and 5 . <br /> If a "barrier" on the order of 2000 feet thick } <br /> ' existed west of Stockton it would be expected that a <br /> ' -114- <br />