10 15 20 



Oislonce from Coost (km) 



25 



iO 



Figure 7. Gulf of Mexico (Texas coast) profiles 



Illustrating an increase In ramp slope, 

 a, From northeast to southwest. 



Or 



10 15 20 



Distance from Coast (km) 



25 



■Igure 8. 



Atlantic coast (North and South Carolina) 

 profiles Illustrating a decreasing zero- 

 Intercept depth, b, from north to south. 

 The dashlines show the ramp slope extended 

 landward to the coast. 



23 



