Basalt necks occur on the surface in Uvalde and Kinney Counties in southwest Texas. These basalt necks are the "serpentine plugs" that produce from the Taylor section in the subsurface of Zavala County. Many plugs exist in both the surface and subsurface.

Geology of the "serpentine plugs" indicates that most of the volcanic activity occurred as post-Austin subaqueous extrusions. Formations below the volcanic material show no structural deformation. Formations above the Cretaceous seldom show evidence of the pile of volcanic material. The most significant evidence of structure and faulting is within the Taylor section.

The application of two dimensional forward lithological modeling is successful in producing a velocity model to display stratigraphic development. The use of an interactive system is an important step in the interpretative process.

Strategically placed seismic lines will give obvious evidence of the existence of a "serpentine plug".

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