Sheppard : Section in the Boulder-ctay near Withernsea. 303 



boulders, had been over-ridden by the ice which deposited the 

 upper or Hessle clay. 



The section shown in the accompanying- photograph occurs 

 in the cliffs opposite Waxholme, about a mile north of the 

 promenade at Withernsea. In a very unusual manner the upper 

 part of the cliff has been washed away, leaving- the top of the 

 purple clay exposed in the form of a shelf or step. This has 

 probably been due to the large amount of fine gravel occurring 

 in the upper part of the cliff, which has been brought down by 

 the percolating water. 



The cliffs at this point are 27 feet in height above the present 

 beach. The lower 15 feet consists of Purple Boulder-clay {b, 

 Fig. i) crowded with various rock fragments, many scratched. 

 Immediately upon and partly embedded in the upper part of this 

 clay is a layer of boulders, principally Carboniferous rocks from 

 Teesdale, many being of large size. Few are rounded, some sub- 

 angular, and many angular. Small striae occur on many of them 

 — generally on the upper surface — though they do not all occur 

 in the same direction. This flat shelf is exposed for about 

 25 feet, and is 12 feet in width. Upon this small area the 

 following boulders are exposed, all being embedded in the clay, 

 and on the same level : — 



Carboniferous Limestone, ang^ular 



rounded 

 (rounded, with Encrinites) 

 (sub-angular) 



,, Sandstone, ang-ular 



,, Cong-lomerate, sub-ang;ular 



Basalt, rounded 

 ,, sub-ang-ular 

 ansfular 



15 X 10 

 14X 15 

 24 X 20 

 30 X 30 X 20 



20 X 12 

 12X10 



20 X 15 

 14 X 15 



12 X 12 



24 X 20 



10x10 



30 X 20 X 18 



20 X 18 X 12 



30 



There are also other boulders of smaller size. Immediately 

 below these boulders, the uppermost few inches of the purple 

 clay is of very dark colour, and is crowded with small angular 

 fragments of various rocks, which have evidently been crushed 

 whilst in their present position, as frequently the fragments are 

 in juxtaposition. 



This dark layer, as well as the line of large boulders, can be 

 traced for some distance to the north and south. xA.bout 25 feet 

 to the north of the section is a large boulder of a red rock 



[905 October 2. 



