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. Tectonic models suggest the absence of a deep water connection on theMozambique Ridge during early Neocomian time. These models imply theinitiation of a deep water connection between the southern Atlantic andIndian oceans formed during Barremian–earliest Aptian times. However,previous biostratigraphic studies of the earliest deep water sediments on theMozambique Ridge suggest that the basal section is Neocomian in age. Here, wepresent a new biostratigraphic analysis undertaken to test this tectonicmodel and determine the earliest age of deep water sedimentation on theMozambique Ridge. Core samples from the Cretaceous interval222.05–406.32  m (Cores 19–32) of DSDP Site 249, Leg 25, weresampled for calcareous nannoplankton and palynological analysis. Most of thesampling was concentrated on the Lower Cretaceous interval below294  m . Our results indicate that the lower sedimentary section is noolder than Barremian and therefore provides support for the age proposed bythe tectonic models.

journal of micropalaeontology

Micropalaeontological dating of the basal Cretaceous section of DSDP Site 249, Leg 25, Mozambique Ridge: implications for the timing of the southern Atlantic–Indian Ocean connection