The Nyckel Ridge is a marked topographic high on the western and southern margin of the Wilmington Canyon on the continental slope and rise southeast of Delaware Bay. The Ridge extends continuously from the outermost shelf to the upper rise. Earlier studies suggested that this feature is a natural levee formed as a result of sediment overflow from the canyon under the influence of Coriolis force. Recent seismic reflection (Sparker) profiles now clearly demonstrate that the Nyckel Ridge is structural, not sedimentary, in origin and is of pre-Quaternary age.

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