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Fig. 7. Reflection seismograph map (1934) showing contours on
the 
base
of the Ferry Lake Anhydrite. Contour interval, 50 ft.
(From Walker, 1953.)
Fig. 8. Surface structure on top of Minden beds compared with
seismic structure on base
of the Ferry Lake Anhydrite. Contour
interval, 10 ft. (From Walker, 1953.)