Abstract
L fe FIG. 1. Location of the Grapevine Area. Grapevine, the two lower members of the Upper Cretaceous system outcrop in parallel north-south beds. The strata dip southeasterly exposing the younger Eagle Ford shale along the eastern border of the county and bringing to the surface the underlying Woodbine sandstone immediately west of the shale (Fig. 2). The soils that have developed from these two formations contrast widely in appearance and composition. The shale constitutes the parent material for a black, calcareous, clayey soil, while the sandstone holds a similar relation to a reddish, non-calcareous, sandy and stony soil. The contact between the formations is clearly marked by a change in soil color and an equally striking contrast in natural vegetation. In their virgin condition the calcareous, clayey soils were occupied by tall prairie grass studded with scattered clumps of mesquite trees; the non-calcerous, sandy soils were heavily timbered with post oaks and black-jack oaks.
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