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The property of anisotropy of magnetic susceptibility (ams) provides a rapid and potentially precise method for estimating the degree and direction of preferred alignment of assemblages of magnetic mineral grains. In the case of sedimentary particles of grain size >50 μm this alignment is commonly due to a combination of gravitational forces, which tend to make elongate grains lie with their long axes in the horizontal plane, and hydrodynamic forces, which cause the long axes to be aligned in a direction related to the azimuth of flow. Under favorable circumstances, determination of this direction of alignment from measurements of the AMS can provide a precise measure of the direction of sediment transport, and place constraints on the possible magnitude of bottom currents. Such information is of considerable value to paleoenvironmental studies. As part of a wider program aimed at establishing generalized paleocirculation trends during the early stages of opening of the Atlantic Ocean, this paper describes an AMS study carried out on the sequence of Aptian-Albian carbonaceous mudstones ("black shales") recovered from Holes 400A and 402A (northeast Bay of Biscay), and the Paleocene-Eocene glauconitic tuffaceous mudstones from Site 403 (southwest Rockall Plateau), on IPOD Leg 48.

Magnetic Anisotropy and Sediment Transport Directions in North Atlantic Early Cretaceous Black Shales and Eocene Mudstones Cored on DSDP Leg 48