Vol. 67.] 



OF ANTIGUA AND OTHER WEST INDIAN ISLANDS. 



689 



which represents a section of the dislocation in its course between 

 the islands, is hypothetical, as we are unable to get to the bottom 

 of the sea to investigate the strata there. I have not in these 

 diagrams indicated the numerous volcanic openings through which 

 the ejectamenta composing the islands came ; but I assume that it 

 will be understood that, speaking generally, the line of fissure which 

 I have marked is the eastern edge of a broken and dislocated area, 

 the width of which was variable and is now occupied by the 

 volcanic formations. 



Fig. 2. — Diagrammatic sections across the Antillean Dislocation. 



(a) Above sea-level (Antigua) 

 Igneous Central Plain Calcareous E. 



(b) Above sea-level (Guadeloupe) 



Salt River 



A A 

 ^a A A A "a'a A A a^'A A\ 

 A a A A A A A A A A A 



A A 



A AAAAA^AA ■ " a 



a\\a a a a a a Aaa a A a 



A A 



A A 



W. 



Sen-level 



(c) Below sea-level 



\/^ 



Purves notices the numerous inlets, bays, gulfs, and creeks that 

 diversify the coasts of Antigua. Dr. Spencer, in accordance with 

 his theories of sunken valleys and a drowned Antillean Continent, 

 emphasizes those features of the island and attributes them mainly 

 to subaerial erosion. He says l that the prolonged denudation has 



1 Q. J. G. S. vol. lvii (1901) p. 493. 



