Bedforms as a function of grain size and flow speed (sed strat)

In this video, I discuss flume experiments and how bedforms also vary with grain size. Diagrams are from John Southard's excellent LibreTexts book "Introduction to Fluid Motions and Sediment Transport" geo.libretexts...)

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How can the presence or absence of pebbles in a succession be used to prove or disprove an aeolian origin?