Cores from the southern edge of the Gulf of Mexico abyssal plain show a vertical repetition of three members: a basal white or gray, medium calcilutite, 30 cm average thickness, commonly cross laminated and with an abundant shallow water benthonic fauna; a light olive-gray fine calcilutite, some 35 cm in average thickness, commonly bioturbated and consisting of a mixture of comminuted shells, micrite, and argillaceous lutite, and with both planktonic and shallow water benthonic faunas; and an olive gray-olive black argillaceous lutite, 50 cm average thickness, either bioturbated or structureless, and containing a scattered planktonic fauna. Deposition was from turbidity currents that originated on the Campeche Shelf followed by a period of abyssal plain sedimentation.

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