On the Association of Granite with the Tertiary Strata near Kingston, Jamaica

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Abstract
T he object of my writing at present is to inform you that, during the last few months, I have been tracing out a very interesting granitic formation traversing this island from the S.E. to the N.W., the direction of our earthquake-shocks. My interest in the investigation was enhanced because it was generally supposed that lower rocks of this intrusive class did not appear on this island, and also by frequently observing small crystals of the carbonate of copper associated with it, by which I was encouraged in the belief that I should find this metal accompanying the granitic formation. This formation first appears in the parish of Port Royal, piercing through the carbonaceous series; then west of the Hope River, in the parish of St. Andrew, between the white limestone and conglomerates. It is consequently of Tertiary age. It sinks below the white limestone at Stony Hill, rises again through the same to the N.W., and trends off into the parish of Metcalfe, where I found the copper associated with the granitic series in the manner the specimens sent with this note will illustrate, which I consider an interesting fact to lay before you. The character of the granitic rock differs materially in the quantity of each constituent, and it is more frequently accompanied with hornblende than mica, the amount of felspar being greater than the quartz. It has, in many instances, undergone decomposition to so great an extent that it is recognized with difficulty. After I surveyed Anguilla, some

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