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Site 544 is located in a water depth of approximately 3581 m on the northwest flank of a structural high from which granitic fragments had been dredged during a presite survey. Five lithological units were described by the shipboard scientific party: I, foraminiferal-nannofossil ooze of Pleistocene to early middle Miocene age; II, clayey foraminiferal nannofossil ooze of early Miocene age; III, pale reddish brown limestone of Middle to Late Jurassic age; IV, grayish red to moderately red-orange calcareous sandy mud (IVA) underlain by mudstone (IVB) and poorly sorted sandy gravel (IVC) on pinkish gray granitic gneiss (IV). We have analyzed only the samples of Unit I, Holes 544A and 544B (0-102 m; Pleistocene to early middle Miocene). They belong to the clayey foraminiferal-nannofossil ooze suite. Calcium carbonate is the main constituent ( 65°7o, except for Sample 544A-3-2, 110-112 cm; see Table 1) with minor detrital minerals (quartz, feldspar, clay minerals). All samples contain small amounts of tiny clear dolomite crystals. Quartz is usually rounded and some samples contain minor amounts of opaques (pyrite?) or hydrous Fe-minerals. The clay mineral suite is dominated by illite, indicating a terrigenous supply, whereas the origin of the fibrous silicates palygorskite and sepiolite is unclear. Chamley et al. (1980) ascribe the fibrous clays in sediment samples from the Moroccan coast to the presence of alkaline marginal basins where they were formed and later

Mineralogy of Cenozoic Sediments Cored during Deep Sea Drilling Project Leg 79 as Determined by X-Ray Diffraction