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Fig. 9. Reflection seismograph map
(1936) showing contours on top of the James Limestone.
Contour interval, 50 ft. (From Walker, 1953.) Fig. 10.
Subsurface map on top of the James Limestone defined by
drilling as of 1953. Contour interval, 25 ft. (from
Walker, 1953.)
Fig. 11. Reflection seismograph map (1944) showing
contours on the Bodcaw sandstone in the Cotton Valley
Group. Contour interval, 50 ft. (From Walker, 1953.)
Fig. 12. Observe gravity map (1947) of the Ruston
field. Contour interval, 0.2 mgal. (From Walker, 1953.)
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