194 Mr. De la Beche on the Geology of Jamaica. 



stone, he states, that the hills which skirt the Cordillera of Venezuela in some 

 places by the sea side (Castillo de San Antonio de Cumana, Cerro del Barigon 

 in the Peninsula of Araya, &c.) appeared to him to belong to the calcaire 

 grossier*. The beds however which he mentions as composing these hills do 

 not agree with the Jamaica rocks, with the exception of the whitish gray com- 

 pact and arenaceous limestone, which contains madrepores, carditse, ostreae, 

 and turbines, and is mixed with large grains of quartz. This last circum- 

 stance is not indeed common in Jamaica, but I have observed at Halse Hall 

 a whitish gray calcareous rock, mixed with grains of quartz, resting upon the 

 white limestone, but seeming connected with it. 



The very limited extent of country in which I observed volcanic rocks in 

 Jamaica, will render it useless to attempt any comparison with similar rocks 

 on the neighbouring continent. It may however be as well to state that I did 

 not find any trachyte which would seem so abundant in South America. 



* Essai Geognostique, p. 312. 



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