Dr. Nugent on the Geology of the Island of Antigua . 469 
parts are different, I thought it would give a clearer representation 
as it is now laid down. The trap fragments of the conglomerate 
will thus be found from the extent of several hundred yards to the 
most minute sizej being finer as you approach the marl, and then the 
more decidedly stratified the clay matrix becomes. 
The limit of the island on the south being thus composed, we 
cannot trace the connection between these boulder trap masses and 
previous formations ; the only satisfaction left for the geologist is to 
ascertain of what rocks the surrounding islands are constituted. 
Without enlarging at present on this subject, I shall merely state, 
that the island of Barbuda, ten leagues to the northward, is entirely 
calcareous ; and, with some singular features of its own, evidently 
belongs to the corresponding formation at Antigua, Montserrat, 
which lies about the same distance to the south-east, is volcanic: and 
Guadaloupe, at rather a greater distance to the south, consists of two 
divisions ; the Basse Town, which is volcanic ; and the Grande 
Terre, which together with Deseada, is calcareous, and like the more 
distant islands of Mariegalante and Barbadoes, is of contem- 
poraneous formation with the districts which I have described in 
Antigua. 
