A submarine seamount similar to the Sigsbee Knolls on the ocean floor of the Gulf of Mexico arose within the Biscaya flysch basin during the Late Cretaceous and early Tertiary. It was generated by a diapir of Triassic evaporites and caused important changes in facies and thickness of turbidite strata.

When turbidity currents reached the submarine hill, sand was deposited mainly on the lower part of the diapir flank, and mud accumulated at the deepest point of the rim syncline.

The knoll also produced a strong dispersion in current directions as indicated by a new method developed for reconstruction of current-direction patterns in space and time.

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