1913.] NATURAL SCIENCES OF PHILADELPHIA. 589 



case the formation described may be readily recognized. Spencer's 

 divisions seem to be more in accordance with the history of the devel- 

 opment of the island as indicated in the record preserved in the rocks. 



Spencer's paper is accompanied by a geological map of Antigua 

 upon which he has laid down his divisions 1, 3, and 4; the other 

 divisions which he recognizes being probably too local and too ill- 

 defined in outline to be mapped. No faults are shown and no 

 geological section accompanies the map. 



The latest paper upon the geology of Antigua which has appeared 

 is by R. J. Lechmere Guppy,^ following an examination of the island 

 made in 1910. As Mr, Guppy states, this examination, on account 

 of his physical disabilities, was necessarily incomplete. His visit 

 to the island was to see if any trace of the "Great Antillean Disloca- 

 tion," postulated in his paper, "Geological Connections of the Carib- 

 bean Region"^ as extending from Trinidad to Sombrero and thence 

 through the northern part of the island of Haiti, was to be found in 

 Antigua. This great fault, Mr. Guppy thinks, passes through An- 

 tigua, through the Central Plain, from Willoughby Bay to St. John's 

 Harbor; the occurrence of which two bays is his principal argument 

 in favor of this fault. Purves, on his map of Antigua, indicates a 

 fault in somewhat the same position as this Great Dislocation of 

 Guppy, but the fault as shown by Purves does not take the same 

 course, running from a little south of Corbizon Point on the northwest 

 coast, about 2 miles to the north of the fault indicated by Guppy 

 (which starts at St. John's Harbor), to a bay between Isaac Point and 

 Steadfast Point, about a mile to the west of the head of Willoughby 

 Bay. Moreover, the fault shown by Purves is not indicated as a 

 dislocation of great magnitude, while that of Guppy is a "Great 

 Dislocation," bringing up the "older beds" of the Antigua Formation 

 of Spencer, which, according to Mr. Guppy, "is of a very Cretaceous 

 aspect." Upon what he bases this statement is not explained, the 

 evidence of the fossils contained in this Antigua formation points 

 to its being of Oligocene age, as will be shown later. But Mr. Guppy, 

 it seems, is not a believer in the occurrence of the Oligocene in the 

 West Indies, as he remarks in this paper (p. 684) : " Even so eminent 

 a professor as J. W. Gregory has fallen into the common error of 

 mixing up the Miocene with the Eocene, and calling the result 

 'Oligocene. ' " Guppy 's paper does not .add much data for fixing the 



* R. J. L. Guppy, "On the Geology of Antigua and other West Indian Islands 

 with reference to the Physical History of the Caribbean Region," Quart. Jour. 

 Geol. Soc. London (1911), Vol. LXVII, pp. 681-700. 



3 Guppy, Tratis. Canad. Inst., Vol. VIII, 1908-1909, p. .373. 



