Waves of sand and snow and the eddies which make them . ^ 7^ 139 SNOW-WAVES AND SNOW-RIPPLES 141. 142 WAVES OF SAND AND SNOW intermediate positions they have an intermediateform, consisting of ridges transverse to the windwith the weather slopes longitudinally are minute shells of foramlniferce, composedof carbonate of lime, in the sand of these source of the foraminiferce is the sand blownin from the sea-shore. The percentage ofcarbonate of lime in the sand decreases withthe distance from the sea. My theory of the origin of the longitudinalridges, some miles in length
Waves of sand and snow and the eddies which make them . ^ 7^ 139 SNOW-WAVES AND SNOW-RIPPLES 141. 142 WAVES OF SAND AND SNOW intermediate positions they have an intermediateform, consisting of ridges transverse to the windwith the weather slopes longitudinally are minute shells of foramlniferce, composedof carbonate of lime, in the sand of these source of the foraminiferce is the sand blownin from the sea-shore. The percentage ofcarbonate of lime in the sand decreases withthe distance from the sea. My theory of the origin of the longitudinalridges, some miles in length, which occur nearthe sea is as follows : viz., that when the sandwas loose it was laid down in transverse ridges ;that the presence of a large quantity of minutegrains of carbonate of lime caused the sand toconsolidate or set under the action of moisture;that the wind then cut through the dunes, forminglongitudinal ridges ; and that the sand removedfrom the surface of the dunes collected from rightand left under the lee of these residual ridges andfinally united in sequence the longitudinal
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Keywords: ., bookcentury1900, bookdecade1910, bookidwavesofs, booksubjectwaves
