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.

ABSTRACT This paper provides a preliminary analysis of the PI90 boring that penetrated the entire Holocene valley fill sequence in Terrebonne Parish, Louisiana. The PI90 boring was acquired as part of the Louisiana Geological Survey -U.S. Geological Survey cooperative research project concerning wetland subsidence in Louisiana. The borehole site is located near Cocodrie, about 19 km inland of Louisiana's coastal barrier islands. A total depth of 65.0 m was reached and recovered, utilizing a combination of wet-rotary drilling and pushcores, 1.5 m in length and 7.62 cm in diameter. From the top of the coarse-grained Pleistocene Substratum (±62.5 m) to the surface, seven coarsening-upward cycles ranging from 3.0 to 12.0 m in thickness were encountered. These coarsening-upward cycles were interpreted by in-situ cone penetrometer and bore-log descriptions. They are indicative of seven separate delta-building episodes during overall regional Holocene transgression.

Abstract A biostratigraphic, chronostratigraphic, and magnetostratigraphic model has been calibrated to produce a new time scale for the Paleogene. The model gives the biostratigraphic position and duration represented by significant unconformities in three areas of the Atlantic and Gulf Coastal Province: 1) western and central Alabama; 2) South Carolina; and 3) central Virginia to southwestern Maryland. In these areas, the most significant unconformity, in terms of duration represented and lateral extent, is found in the lower Eocene. In Alabama, this unconformity centers around 51.4 m.y. and represents a hiatus of about 1.4 m.y. In South Carolina, this unconformity centers around 50.3 m.y. and represents a hiatus of about 10.0 m.y. In Virginia-Maryland, the lower Eocene unconformity centers around 49.0 m.y. and represents a hiatus of about 7.3 m.y. A significant unconformity exists between the Cretaceous and Tertiary in all three areas. On the Atlantic coast the Cretaceous-Tertiary unconformity represents some missing Danian and significant missing Maestrichtian. In Alabama, however, there is virtually a complete Danian section and it is only most of the upper Maestrichtian that is missing. There are significant regional unconformities in all three areas.