On the Birds of the Islands of Aruba, Curaçao, and Bonaire #271646

The interior parts of the islands consist of sedimentary rocks, in several places pierced by volcanic rocks, while on Aruba grey granite is said to predominate, and many quartz veins are found, containing a considerable amount of gold. Deposits of phosphate are distributed over the islands (of. Blackburn, 'aruba-phosphate,' p.