Abstract
The northern district of the Island of Trinidad, with the islands between it and the mainland, is composed of flagstones, slates, and schists, with quartz-veins and some dark-coloured intercalated limestone. These rocks are all apparently unfossiliferous; the slates often abound with iron-pyrites and magnetic iron-ore, and some of the ochreous quartz-veins (gossans) are slightly auriferous. Stalactitic caves occur in the limestone of the Island of Gaspar Grande, and at Las Cuevas and Arouca. Alluvial beds of clay and gravel are extensive in this district, and are sometimes 60 feet thick. At Lateen Bay, in Chicachicare Island, a patch of aluminous clay-slate occurs, with seams of crystalline limestone. The soil of this northern district is fertile on the limestone, and barren on the slates. The slate-rocks appear to be the same as those of Venezuela, which overlie the quartz-rock that crops out at Upata; and rounded boulders of quartz-rock occur in the flagstones.
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