Trinity/Brazos/Colorado Fan

During the last eustatic lowstand, the Sabine, Trinity and Brazos incised river valleys converged on the east Texas shelf and nourished a lowstand delta that occupied the shelf margin. Progradation of the lowstand delta across the shelf-break resulted in down-slope transport of sediments. These gravity flows were captured by a series of salt-bounded minibasins on the upper slope (Winker, 1996). These minibasins have been the focus of detailed marine geophysical surveys, including swath bathymetry and high resolution surveys (Rice University, Exxon and Shell)(Rothwell et al., 1991; Anderson et al., 1996; Winker, 1996).


Paleogeographic features of offshore eastern Texas associated with last Pleistocene lowering of sea level (Winker, 1996).




Bathymetric map of the study area, hand-contoured from 2-D seismic water-bottom picks. Contour interval = 100 ft. (Winker, 1996).




Isopach map and seismic-stratigraphic features of the Brazos-Trinity Fan (Winker, 1996).




North-south profile of the Brazos-Trinity Fan. All features are projected orthogonally onto the line of section. V's represent channel cross-sections (Winker, 1996).




High-resolution seismic dip profile of Basin II, showing differntiation of major seismic facies (Winker, 1996).






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