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Orientation of iceberg drift in the Norwegian Sea. Rose diagrams showing the normalized frequency distribution of iceberg ploughmark orientations for each of the interpreted Naust palaeo-surfaces. Semi-transparent light blue sectors highlight the surfaces that contain anomalous (i.e., > 10%) fraction of ploughmarks oriented between 135° and 180°. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
