Waves of sand and snow and the eddies which make them . s#. •^ a rj ^ CJ ri r^-a ZJ -*- o O a y c/l ^ rt ?« -o o !U n o Tj ^ rt ?/I q5 :j Q ~? o -t-^ o ^ Si 287 RIPPLE-MARK AND CURRENT-MARK 289 the depth or turbidity of the water. The shortestof these which I have measured had an averagewave-length of 4 feet. Most of my observationsof these larger sand-waves have been on sand-banks which dry out at low water in tidal situation was generally such as to show thatthey were produced either by the current of theflood tide or by that of the ebb, and their nn-sylnmetrical form support
Waves of sand and snow and the eddies which make them . s#. •^ a rj ^ CJ ri r^-a ZJ -*- o O a y c/l ^ rt ?« -o o !U n o Tj ^ rt ?/I q5 :j Q ~? o -t-^ o ^ Si 287 RIPPLE-MARK AND CURRENT-MARK 289 the depth or turbidity of the water. The shortestof these which I have measured had an averagewave-length of 4 feet. Most of my observationsof these larger sand-waves have been on sand-banks which dry out at low water in tidal situation was generally such as to show thatthey were produced either by the current of theflood tide or by that of the ebb, and their nn-sylnmetrical form supports this conclusion. Indeep-water channels up and down which the tidesflow and ebb the alternating currents form, weare told, large sand-waves of symmetrical form » ;but I have not had an opportunity of examiningthese submerged ridges. The question I should like to answer somewhatmore definitely than I am able is whether thesmaller current-mark and the larger current-formedsand-wave grow at the same time and place, asdo ripples and waves formed by t
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