Geology 



sandy layers contained numerous fossil sponges, and as 

 the white sand presented a peculiar glistening appear- 

 ance, we took some of it with us for microscopic 

 examination. 



At the base of the Lower Greensand was a thin layer 

 of conglomerate, the pebbles in which were small and 

 well-rounded and consisted of white quartz. 



Below this there was a sudden and complete change 

 in the colour of the rocks, and also in their angle of 

 dip which, though still in the same direction, changed 

 suddenly from 5 to 30 (see Fig. 16). 



The material below the conglomerate was a bright 

 red sandstone which showed current-bedding in a marked 



c } a, 



FIG. 16. #, Sand ; Z>, Chalk ; <:, Upper Greensand ; d, Gault ; , Lower 

 Greensand ; /, Trias. 



degree, and on closer examination was found to consist 

 of grains of sand as round as millet seed, and sorted out 

 into layers of equal sizes. A prolonged search failed to 

 reveal any traces of fossils in these red beds. The 

 section through the gorge is seen in Fig. 16. 



Not far from the upper surface of the red sandstone 

 was a layer containing pebbles of quartz, and some of 

 these had a curious triangular section, and possessed a 

 glaze similar to that which was being produced by the 

 wind-blown sand on the surface of the chalk at the foot 

 of the gorge. Some twenty or thirty of the pebbles 

 were collected, and small boxes were filled with sand 

 grains from the different layers. 



Sand was also collected from the beds of Greensand 



112 



