Martin S. Oczlon; Ocean currents and unconformities: The North Gondwana Middle Devonian. Geology ; 18 (6): 509–512. doi: https://doi.org/10.1130/0091-7613(1990)018<0509:OCAUTN>2.3.CO;2
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Middle Devonian sedimentary features in many areas of the North Gondwana margin, today situated between Spain and Iran, indicate influence of currents. These features are deposits of contourites, condensations, and surfaces of nondeposition or erosion with paraconformity or erosional disconformity, all common occurrences beneath modern ocean currents such as the Gulf Stream. A paleogeographic reconstruction for the Middle Devonian is used to show how the interdependence of continental arrangement, latitudinal position, and ocean-current activity on the margin can reconcile apparently conflicting stratigraphic and sedimentological features.