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We studied the clay fraction minerals and their distribution in the sediment sections of Sites 407 and 408, situated between the Reykjanes Ridge and the southeastern shore of Greenland, and Sites 410 and 412 in the Mid-Atlantic Ridge area. The complex of clay minerals in the relatively young sediments of Leg 49 (lower Miocene to Pleistocene) is characterized by poor associations and uniform distributions. Additionally, the clay fractions of sediments from the northern region are highly enriched in amorphous matter, volcanic glass, or opaline matter of siliceous organic remains. METHODS We studied the clay fraction (

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