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Occurrence of magnesian silicates of the palygorskite and sepiolite type proved widespread and is shown in Figure 1. These minerals occur in the Albian of Site 368 and the Cenomanian of Site 370. Palygorskite frequently occurs with sepiolites; this is unusual for platform deposits. Palygorskite also occurs in Eocene sediments: lower Eocene of Hole 366, lower and middle Eocene of Hole 370, middle Eocene of Hole 369, and upper Eocene of Hole 368; in Hole 367, palygorskite occurs in Upper Cretaceous and lower Eocene sediments. Magnesian silicates are associated with the following lithologies (Figure 2): 1) Clay and claystone with gentle wavelike laminations (Hole 368, Upper Cretaceous to lower Eocene). 2) Claystone with interlayers of sandy silty material (Hole 370, lower to middle Eocene; Hole 368, upper Eocene). 3) Nannofossil marl alternating with claystone and siltstone (Hole 370, Cenomanian to upper Paleocene). 4) Nannofossil marl with burrows (Hole 369, Albian). 5) Limestone with interbeds of clay (Hole 369, middle Eocene; Hole 366, lower Eocene). Tables I through 5 and Figure 2 show that in Holes 366 and 369, magnesian silicates are associated with organogenic clay and carbonate sediments, whereas those of Holes 368 and 370 are associated with terrigenous and, at Site 368, with partly chemogenic sediments.

Palygorskite, Sepiolite, and Other Clay Minerals in Leg 41 Oceanic Sediments: Mineralogy, Facies, and Genesis