Abstract

Permian desert dunes in northwestern Europe, previously thought to exhibit a transverse pattern, are herein reinterpreted as oblique. Evidence includes a) a light cluster of foreset dip directions; b) cross-bed dip angles of 15 degrees to 28 degrees ; c) concave-upward curvature of bed profiles; d) sweeping bundles of thin laminae generated by ripple migration with minor grainfall influence at the bottom and increasingly thicker laminae with a greater grainfall influence upflank; straight-crested, alongslope-trending ripples are commonly present; e) grain population better or equally sorted upflank, in sharp contrast with slipface sands, which are more symmetrically skewed and better sorted downslope. The cases examined are from the Isle of Arran, the English Midlands, the North Sea, and the German basins. Interpretation of the dunes as oblique rather than transverse implies that in most cases the prevailing winds were northerly and not northeasterly and easterly.

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