Yol. 67.] THE GEOLOGY OF ANTIGUA. 681 



19. On the Geology of Antigua and other West Indian Islands 

 with reference to the Physical Histoey of the Cakibean 

 Region. By R. J. Lechmere Guppy. (Communicated by 

 Prof. E. J. Garwood, M.A., Sec.G.S. Read May 24th, 191].) 



[Plate L— Map.] 



Contents. 



Page 



I. Introduction 681 



II. Considerations on the Geology of* Antigua 681 



III. Considerations on the Geology of Barbados 692 



IV. The Parian Sub-Continent 695 



V. Considerations on the Geology of Trinidad 696 



YI. Note on the Origin of Manjak, Petroleum, etc 699 



I. Introduction. 



My paper on the ' Geological Connexions of the Caribean Region ' l 

 dealt as a whole with the Atlantis Problem and the changes on the 

 earth connected therewith. Among other matters, I indicated the 

 course of the dislocation (which I will call the great Antillean 

 Dislocation) passing along the chain of the Antilles from Trinidad 

 to Sombrero, and thence as I suggested through the northern 

 part of the Island of Haiti. To make such further observations as 

 were possible to me despite my physical disabilities, I undertook a 

 voyage to Antigua and the neighbouring islands in the early part 

 of 1910. 



In the preparation of this paper I have consulted all the 

 authorities available to me, but I have made most use of the papers 

 by Purves and Spencer. Por Dr. J. W. Spencer's papers I am 

 indebted to himself, and for Purves's I am indebted to the Natural 

 History Society of Belgium. 



II. Considerations on the Geology oe Antigua. 



Geologists and all interested in West Indian geology owe much 

 to men who, like Nugent (a resident) and Purves (a visitor), under- 

 take to furnish a careful and conscientious account of the features of 

 a neglected and despised island such as Antigua, High praise is 

 due to them. In the time of Nugent (1819) geological science was 

 in a backward state, and he did not therefore enjoy the means that 

 his successor possessed of* dealing with geological subjects. Yet 

 Nugent's work is the basis of our knowledge of the geology of 

 Antigua. He was followed by J. C. Purves, whose memoir was 

 published in the Bull. Mus. Roy. Hist. Nat. Belg. vol.iii (1884-85) 

 p. 273. Any one who has an idea of what it is to explore geologic- 

 ally a tropical island must feel grateful to Purves for his elaborate 

 and conscientious survey. Nevertheless, in such cases there is 



i Trans. Canad. Inst. vol. viii (1908-1909) p. 373. 



