56 



vaughan: virgin and leeward islands 



0-- 

 /OOl 



aoo. 

 3oo: 



5^/g L£l/SL 



~~ K I — 1 ~ 



-Barn er . M^^^ mm ^- .. -Barrier --^^^ Barrier ^^^_ Barrier 



Borner 

 reef 



PROFILES OFF SOUTH COAST OF ST JOHN. TORTOLA 

 AND VIRGIN GORDA ISLANDS. 



PROFILES OFF THE NORTH COAST OF ST THOMAS 



SEA LEVEL 



PROFILES OFF THE EAST COAST OF ANGUILLA 



Nautical Miles 



I 1 2 3 « 5 6 



Fig. 3. Profiles off Virgin Islands and Anguilla. 

 the horizontal. 



Vertical scale 70 times 



The Second type of submarine profile is well represented off 

 the north shore of St. Croix and the south shore of Cuba (see 

 fig. 2). The precipitous character of these profiles indicates 

 faulting and the geologic structure supports this interpretation. 

 There is a downthrown block between St. Croix and the Virgin 

 Group, and another downthrown block between Cuba and 

 Jamaica. 



The third type of profile (see fig. 2), represented by shores 

 off which are extensive shallow flats, occurs where planation agen- 

 cies have long been active. Here the rocks often, if not usually, 

 dip under the sea at relatively gentle angles. 



