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The Cretaceous limestone and limestone rubble beds of Jamaica that contain the rudist Titanosarcolites with associated macroinvertebrates, and the shales between them, contain a diverse ostracode assemblage. The same is true of the shales associated with the so-called oyster limestones. Samples from the Central, Maldon, Marchmont, and Jerusalem Mountain inliers have yielded more than 123 species, only two of which can be confidently assigned to known species. Many of these taxa are rare or are still under study, but 38 common forms allow the division of the studied interval into three very distinct zones, the oldest of which can be divided into three subzones. The Titanosarcolites and associated shales of the Central, Maldon, and Marchmont inliers can all be placed in the oldest zone delineated. Using the subzones of this zone, lithic units can be correlated from inlier to inlier. The small Jerusalem Mountain Inlier has two different ostracode assemblages. The Titanosarcolites beds of this inlier are placed in one of these, and the younger oyster limestone beds and associated shales fall in the other.

The presence of the genera Schizoptocythere, Buntonia, and Ovocytheridea indicates a tropical Tethyan affinity for the Jamaican ostracode fauna. It is distinctly unlike the richly fossiliferous deposits of the North American Coastal Plain.

A review of the chronostratigraphic position of the Campanian-Maastrichtian boundary and an alternate interpretation of recently published calcareous nannofossil data for the Jamaica deposits support the conclusion of macrofossil workers that the Titanosarcolites beds are Maastrichtian and not partly Campanian in age.

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