Volcanic Disturbances in West Indies 227 



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Political Map of Windward Islands 



tholomew, are also Antillean in struc- 

 ture, and were it not for the deep Ane- 

 gada Passage, which almost severs the 

 latter from the submerged platform at 

 the north end of the Windward Channel, 

 they might probably be considered An- 

 tillean. 



All the Windward Islands with the 

 exception of Barbados probably have a 

 base of volcanic rock, notably St Mar- 

 tins and Antigua of the outer chain. 

 The Windward Islands constitute a 

 unique and peculiar geologic province, 

 the discussion of which, with their gen- 

 eral phenomena, can now be briefly 

 considered. 



The islands of the chain, however, 

 south of the Anegada Passage and north 

 of Trinidad, constitute a different geo- 



logic type, which may be classed by 

 composition into three general sub- 

 types as follows: (1) Volcanic islands 

 composed almost entirely of igneous ma- 

 terial ; (2) islands composed, at their 

 surface at least, of organic oceanic sed- 

 imentary debris, and (3) compound isl- 

 ands, with a higher summit region of 

 volcanic rocks of the first-mentioned 

 class, with added areas or benches of 

 sedimentary rocks. These three types 

 are exemplified in Martinique, Barbuda, 

 and Antigua. 



WINDWARD GROUP 



The Windward group is divisible into 

 two parallel belts extending the length 

 of the archipelago. The eastern belt, 



