hill: geology of JAMAICA. 169 



their relations are harmonious. I shall also be able to show a remark- 

 able difference in some respects between the formation of the Great 

 Antilles and the Caribbee Islands. 



In Cuba and Haiti alone of the "West Indies (excepting Trinidad. 

 Avhich is as much South American as is Long Island a part of the 

 New England coast) is it at all probable that Pre-Cretaceous or older 

 rocks than in Jamaica are exposed, although theoretically it is even 

 possible that the submerged portions of all the West Indies including 

 Jamaica may have a Paleozoic foundation. Cuba and Haiti it should 

 be remembered, with Porto Eico and the Virgins, are in the main 

 axial line of the Antillean uplift, and it is highly probable that older 

 rocks occur in them, while Jamaica is an outlier or offshoot of this 

 main axis. 



The Cuban rocks also contain some mica schists and other classes 

 of rocks which as yet have not been found in Jamaica except in the 

 later debris. Henneken,^ and perhaps others, have described micaceous 

 schists of supposedly Pre-Cretaceous age in San Domingo. Duchassaing^ 

 has described a Paleozoic coral {Favosites Dietzii) from St. Thomas. 

 Cleve,^ however, was inclined to believe that this specimen is not native 

 to the island. 



Castro and Salterain^ consider that in Cuba there occurs a consider- 

 able range of Pre-Cretaceous rocks, some of which were questionably 

 considered and mapped as Paleozoic. Salterain has referred certain 

 formations, notably in the western province of Pinar del Rio, which the 

 writer has not had opportunity of personally studying, and an area 

 near the city of Trinidad, to the Paleozoic, Triassic, and Jurassic 

 periods. ^ 



With the exception of the foregoing, and certain observations of 

 Frazer and Bergt to be noted later concerning the islands of Cuba 

 and Haiti, there are no records of exposures of any Pre-Cretaceous 



1 On Some Tertiary Deposits of San Domingo. Quart. Jour. Geol. Soc. London, 

 1853, Vol. IX. p. 115. 



2 Mem. della Acad. dell. Scien. di Torino, 11 ser., Tom. XIX. p. 84, 1860, and 

 Ibid , 1866, Tom. XXIII. p. 199. 



8 Geology of the Northeastern West Indian Islands. By P. T. Cleve. Stock- 

 holm, 1871. 



4 Croquis de la Isla de Cuba, 1869-1883. 



^ Lea has also described from near Havana two Brachiopods, Terehratula poei/ana 

 and Rhi/nchonella tajjloriann, wliich are very similar to certain forms from the 

 Jurassic of Mexico and South America. See Trans. Amer. Phil. Soc, Phila., 1841, 

 Vol. VII. pp. 258-260, PI. X. Figs. 12 and 13. 



