. Bulletin. shale. As development proceeded dowft the dip of the anticline towardthe southeast, water began to be encountered. At that tune practicaloil men were unable to account for this water, but it is now knownto have been intermediate water lying on top of the black shalemarked B in figure 27, Shortly downslope from the point at which water was first en-countered extensive oil showing ceased to be found in that partof the Vaqueros formation lying above the black shale. Thus theformation is separated into an upper horizon and a lower one, thedividing line being the black shale and the edg
. Bulletin. shale. As development proceeded dowft the dip of the anticline towardthe southeast, water began to be encountered. At that tune practicaloil men were unable to account for this water, but it is now knownto have been intermediate water lying on top of the black shalemarked B in figure 27, Shortly downslope from the point at which water was first en-countered extensive oil showing ceased to be found in that partof the Vaqueros formation lying above the black shale. Thus theformation is separated into an upper horizon and a lower one, thedividing line being the black shale and the edge water lying on topof it. The productive limit of the upper horizon corresponds closelyto the point at which water was first encountered. 1 Anderson, Robert, and Pack, R. W., Geologj- and oil resources of the west border ofthe San Joaquin valley north of Coalinga, Calif.: Bull. 603, U. S. Geol. Survey, 1915,p. 84. BUREAU OF MINES BULLETIN 195 PLATE XIX ICOO 500 o :ryt//^, JS s^yy^ys ?..;.j! /%. SKETCH SHOWING ENCROACHMENT OF EDGE WATER COALINGA ANTICLINE, FRESNO CALIF. BUREAU OF MlNES 5ULLETIN 195 PLATE XX
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