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Initially, Vernon field was believed to represent a simple stratigraphic pinch-out of Lower Cotton Valley sandstones against regional southerly dip.  Existing seismic data quality was sparse and of poor quality, and individual pay intervals were not seismically resolvable.  However, a limited number of 2-D lines hinted at divergent dips south of the northern sand limit, suggesting the possibility of an expanded stratigraphic section in the Lower Cotton Valley.  A more favorable price environment beginning in 2000 resulted in accelerated field development, during which a number of wells were found to have pay intervals partially faulted out.  This was used as an economic justification for a large 3-D