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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.)