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Mesozoic foraminifers recovered from DSDP Leg 50 Sites 415 and 416 in the Moroccan Basin of the eastern North Atlantic range in age from Late Jurassic to middle Cenomanian. At Site 415, sediments range in age from late Albian to middle Cenomanian, as inferred from 19 species of planktonic foraminifers and selected benthic foraminifers. Assemblages are dominated by hedbergellids, whereas rotaliporids are few, and ticinellids are absent. Deposition took place beneath the calcite-compensation depth in a quiet, abyssal environment, at water depths of 3000 to 4000 meters. This environment received a regular influx of shallow-water material that decreased with time and was finally replaced by hemipelagic sediments. Foraminifer assemblages of Site 416 range in age from Late Jurassic (Tithonian-Kimmeridgian) to early Cenomanian. The assemblages consist of 172 species of benthic foraminifers and three species of the planktonic genus Hedbergella, represented by seven specimens. During the Neocomian, shallow-water material was emplaced into a quiet, lower bathyal to abyssal environment beneath the calcite-compensation depth, at water depths of 2000 meters or more. As a result of this high rate of sedimentation, 35 of the 53 Mesozoic cores are Valanginian. Before and after the Neocomian, the rate of sedimentation was lesser. Foraminifers representative of slope environments are found throughout the Upper Jurassic and Neocomian; they are strongly similar to shelf assemblages and comprise nodosariids and simple, agglutinated species.

Mesozoic Foraminifers and Deep-Sea Benthic Environments from Deep Sea Drilling Project Sites 415 and 416, Eastern North Atlantic