Abstract
End_Page 1563------------------------------The Nacatoch Sand, the middle formation of the Navarro Group, consists of marine sandstones and mudstones derived largely from a source area to the north and northeast of the east Texas embayment. Terrigenous clastics were supplied to the Nacatoch basin by two major dispersal systems: (1) a bifurcating northwestern and northern system in southern Hunt and southern Delta Counties, and (2) a northeastern system originating in southwestern Arkansas. Five facies are recognized in surface exposures of southwestern Arkansas: tidal flat, tidal channel, tidal inlet association, shoreface, and shelf facies. In northeast Texas, a deltaic sequence is recognized in southcentral Hunt County, and shelf sandstones and mudstones are present in Navarro and Kaufman Counties. Nacatoch sandstones in the East Texas basin are significant shallow oil and gas reservoirs. Production of hydrocarbons from the Nacatoch is restricted to the shelf-sand facies. Hydrocarbon occurrence is perhaps more a function of structural closure than depositional facies. Hydrocarbon production is associated with the Van salt dome in Van Zandt County and coincident with the Mexia fault system trend along the western margin of the basin. End_of_Article - Last_Page 1564------------
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