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The major aims of Leg 15 of DSDP — to drill down to acoustic basement in as many sites as possible and to attempt to recover a complete sedimentary succession — were both successfully fulfilled. The present report covers the older part of the sedimentary succession recovered during this leg, with special reference to its foraminiferal content. Only the six sites where the Late Eocene to latest Turonian sediments were recovered have been considered in this report (see Figure 1). The cores recovered from Sites 146 and 149 together form a more or less complete succession of Late Turonian to Late Eocene. Problems concerning the Cretaceous-Tertiary boundary, selective solution at depths, and the variations in the sedimentation rates are dealt with. The shipboard work on foraminifera of Sites 146 to 154 was carried out jointly by both authors irrespective of the age of penetrated strata. For the preparation of this initial report, however, the part of Cretaceous to Late Eocene was studied and written largely by Premoli Silva, that on Oligocene to Recent by Bolli. The foraminiferal specimens figured on Plates 4 to 10 are deposited at the Natural History Museum, Basel, under the numbers C-29458 to C-29498.

Late Cretaceous to Eocene Planktonic Foraminifera and Stratigraphy of the Leg 15 Sites in the Caribbean Sea