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Mesozoic benthic foraminifers, recovered from five single-bit holes drilled in the southern Gulf of Mexico on Deep Sea Drilling Project Leg 77 are rare, poorly preserved, and scattered throughout the dominantly redeposited sediments. The Mesozoic sequence at basin Sites 535 and 540 consists largely of laminated limestone with smaller amounts of skeletal limestone and pure pelagic limestone, whereas the Mesozoic sediments at basement Sites 536, 537, and 538 (Hole 538A) consist largely of oolitic-oncolitic limestone. At all sites, benthic foraminifer assemblages consist mainly of mixed bathyal and neritic forms, with neritic material at times strongly diluting and masking the autochthonous bathyal fauna. The recurrent bathyal assemblage is indicative of water depths of 1000-1500 m with a possible increase to 1500 m or greater in the Late Cretaceous in Hole 538A. The present water depths of the sites range from 2742 m in Hole 538A to 3450 m at Site 535. All sites show evidence of reworked older pelagic and shallow-water material throughout the intervals cored. Maximum influx of shallow-water and reworked material occurs in two pulses—in the Valanginian, and from the latest Albian through middle Cenomanian. In the early episode, the terranes eroded were mainly carbonate platforms of Jurassic and Berriasian age. This event was confined primarily to the western (Yucatan) side of the Gulf of Mexico. Later, in the Cenomanian, the erosional event is recorded on both sides of the Gulf, but was more intense on the eastern (Florida) side. Reworked and displaced shallow-water material was derived from carbonate platforms of late Aptian to middle Albian age.

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Autochthonous and Displaced (Allochthonous) Cretaceous Benthic Foraminifers from Deep Sea Drilling Project Leg 77, Sites 535, 536, 537, 538, and 540, Gulf of Mexico