Three marine hydraulic energy zones in shallow epeiric seas are: a hundreds-of-miles wide, low-energy zone in open sea beneath wave depth (Zone X); an intermediate, high-energy belt, tens of miles wide, beginning where waves first impinge upon the sea floor and extending landward to the limit of tidal action (Zone Y); an extremely shallow, low-energy zone, tens- to hundreds-of-miles wide, occurring landward of Zone Y, in which there is little circulation of water, tides are essentially wanting, and wave action is produced by local storms (Zone Z). In 'clear water' epeiric seas receiving no terrigenous clastics, sediments formed in Zone X are mainly fine-grained detritus from Zone Y; in Zone Y are basically of biogenic origin, sand-size or coarser, and most likely to become primary reservoirs; in Zone Z are primarily fine-grained and tight, and of chemical origin

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