DESCKIPTION OF PLATE XVII. 



[FIGURE 1. 



Section from St. John to Jost Van Dyck (Virgin Islands). 



1, 1, St. John. 



3, 2, St. Thomas. 



3, Great Thatch Island. 



4, Jost Van Dyck. 



5, Tortola. 



6, Tobago. 



7, Iguana ("Guana") Island. 



a, Cold Point, St. Thomas. 



b, Mary's Point, St. John. 

 F, Felsite. 



B, "Blue-beach." 



M, Metamorphic rocks. 



L, Limestone. 



D, Diorite. 



The dotted lines indicate islands not on the precise line of section. 



FIGURE 2. 



Sections from St. Croix to Tortola, and from Nevis and Antigua to Anguilla. 



I, Antigua. 



II, Nevis. ] 



III, St. Kitts. -D . r 1 



IV, St.Eustache. ^Post-phocene volcanoes. 



V, Saba, J 



VI, St. Croix. 



VII, St. Bartholomew. 



VIII, St. Martin. 



IX, Anguilla. 



X, St. John. 



XI, Tortola. 



XII, Anegada. 



C, Cretaceous. 



E, Eocene. 



M, Miocene (and Pliocene). 



P P, Post-pliocene. 



