12 3 4 5 

 j__i I — I — I — I 



SCALE IN NAUTICAL MILES 

 • — CORE LOCATION 



CONTOUR interval: 10 ft 



Figure 10. Isopach Map Indicating Depth Below Bottom (in feet) of the 

 Blue Horizon, Gray areas indicate subsurface depths of 

 less than 10 feet. Note the thicknesses of sand under- 

 lying the shoal surfaces. 



27 



