240 



MR. A. WADE ON THE 



[May 191 1 



material at times shows excellent cubes of salt under the micro- 

 scope, and many of the hollows appear to have cube-like forms. 

 Footprints, sun-cracks, and wind-ripples impart a Triassic aspect to 

 the sands in places, especially where large sea-birds have left their 

 tracks. 



Fig. L\ — Sand with ' dreihanterj from the sandy gravej-jilains north 

 of the Gulf of Jemsa. (Natural size.) 



Many of the gullies are being filled with sand, and one can easily 

 recognize the sifting effect of the wind. The particles of sand in 

 the deposit at the foot of a gully are much coarser than at the 

 head, and contain numerous flakes of granite and andesite derived 

 from the neighbouring rocks. Here the sand is rather firm : as 



