Field and Laboratory

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In the Dallas quadrangle, the Eagle Ford shale and Austin chalk, both Upper Cretaceous, are concealed over about 30% of the area by alluvial deposits of the Trinity River. The late Cenozoic history of the area has been one of progressive uplift with alternate episodes of channeling and filling along the Trinity and its tributaries. As a result, three and possibly four ancient floodplains now stand as terraces bordering the bottom-lands. The names and respective heights of these terraces above the Trinity River flood plain are as follows: Marsalis, 110 feet; Love Field, 70 feet; Travis School, 60 feet; and Union Terminal, 35 feet. The Marsalis, Love Field, and Union Terminal terraces are well defined benches, but the Travis School terrace is poorly developed, and consequently, its relative age has not been satisfactorily determined. In this connection there are three possible alternatives. It may be merely a dissected portion of the Love Field terrace. Or it may represent a distinct terrace intermediate in age between the Love Field and Union Terminal. Finally it may be an alluvial fan of Turtle and adjacent creeks, possibly built out upon the Union Terminal level. Of these three possibilities, the first seems the most probable.

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