Previous investigation of the bauxite of the Caribbean Islands has resulted in the publication of two opposing theories of origin for these deposits. (1) The bauxite represents a residual accumulation of the insoluble constituents in the White Limestone formation that underlies the deposits in Jamaica. (2) The bauxite was derived from the alteration of a volcanic ash that was deposited on the limestone. In the latter case the heavy minerals would be expected to vary in the bauxite and in the limestone. This study of the bauxite and associated formations of Jamaica shows that the bauxite and White Limestone have similar heavy mineral suites. The important feature displayed by the heavy minerals in the White Limestone is the presence of titanium in the following minerals: ilmenite, rutile, leucoxene, and titaniferous magnetite. Hence, a residual accumulation from the limestone should contain TiO 2 . Moreover, the presence of titanium in the bauxite does not necessarily imply that these deposits were derived from a layer of volcanic ash. The author concludes that the probable source of the bauxite is the White Limestone formation.

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