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Guppy Reprint 
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earth movements, and in 1113" paper on the “geological connexions 
of the Caribean Region’’ I indicated on a map what I conceived 
to be the course of the principal dislocations, the most evident of 
which I have called the “great antilliau dislocation.’’ I exhibit 
this map to 3’ou now. In the early part of 1910 I visited Antigua 
and other islands with a view' to extending 1113- acquaintance wdth 
the geolog3' of the.se I.slands. In previous 3'ears I had explored 
.several of the islands, particularl3' Dominica, St. Vincent and 
Page 2j 
Grenada. In spite of m3' ph3'sical disqualifications I w'as enabled 
to discover some ver3' important facts and to make these known I 
drew up a paper which w'as read to the Geological Societ3' of 
Loudon on the 24th May last. I exhibit cop3' of the paper and 
w'ill briefl3' explain its purport. 
Before 1113' visit to Antigua I w'as under the impression that 
the volcanic rocks of that island belonged to a different period 
and that the great antillian dislocation did not pass through it 
but to the west and south of it. There w'as nothing in the writ- 
ings of the authors w'ho had previously w'ritten of Antigua to 
lead me to doubt this view'. 
After noticing the work of former observers on the geolog3' 
of Antigua, I gave a brief description of the formations of that 
island, show'ing that it is divided into three principal regions — 
(i) the Volcanic (or Igneous) Region ; (2) the Central Plain ; 
and (3) the Calcareous Formation, the first -named being, accord- 
ing to previous authors, the olde.st, as it is pre-tertiar3', and the 
others following in succe.ssion. The calcareous formation, hith- 
erto considered the newest, contains fossils, of w'hich the most 
remarkable is a species of Orbitoides. After a discussion of the.se 
formations and especial^' of the evidence for the so-called ‘Oli- 
goceiie’ age of the calcareous formation, the conclusion is reached 
that this formation is the oldest — not the 3'oungest, and is 
probabl3' Eocene or older. The island was raised above sea-level 
by the development of the great antillian di.slocation , w'hich di- 
vides each of the i.slands of Guadelupe and Antigua into tw'o parts, 
of which the eastern is calcareous and the western volcanic. In 
