Longitudinal grooves or “furrows and ridges”: U-shaped depressions – gouges – open ended at both ends, with subparallel sides occurring on the top surfaces, on the upwind sides of rocks with horizontal or gently inclined surfaces (Fig. 1). (Cf. km-scale grooves: mega- yardang; megascale glacial lineations).
Flute (flute mark) (Figs. 2, 3, and 4): U-shaped, closed-ended (at the upstream end), near-linear depression. Transitional form between pits and grooves. This type of scour mark is not considered to be linear or transverse; they have comparatively equal downstream and across stream dimensions, with an overall spoon-shaped geometry, and are elliptical or U shaped in planform (Macdonald 2010). They are...
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