48 
The American Geologist. 
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GEOLOGICAL AGE OF THE WEST INDIAN VOL- 
CANIC FORMATIONS. 
By J. W. Spencer, Toronto. 
The Greater Antilles appear to be nearly devoid of volcan- 
oes. The writer has seen only the remains of one in Jamaica 
(at Low Layton), and none in Cuba. But there are extensive 
underlying ig-neous formations in all these islands. How- 
ever, in the inner zone of the Caribbean or Windward islands 
there are many cones, and beneath these and the outer islands 
there is an underlying volcanic basement. In such of the outer 
islands as St. Martin and better still in Antigua, and in St. 
Croix one gets some knowledge of the antiquity of the older 
eruptive formations. In Guadeloupe the geological records 
are equally well preserved, on one side, while on the other 
there are the more recent volcanic cones, which can also be 
seen in St. Kitts, Statia, Dominiqua. Martinique, St. Lucia, 
St. Vincent, etc. 
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In St. Martin and Antiqua the old volcanic basement forms 
mountains still uncovered bv modern cones, as also in St. 
