280 
COAST CHANGES AT ROBIN HOOD’S BAY. 
\ LIONEL WALMSLEY. 
(PLATE XIII.). 
DurInG the last few years the Boulder Clay of Robin Hood’s 
Bay has greatly suffered denudation, resulting in the loss of 
much valuable land, 
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The thick lines indicate the chief cracks and movement planes. The arrows indicate 
direction of movement ; and the figures the amount in feet of vertical displacement. 
25 inches = 1 mile. 
This denudation is no doubt due to the thick bed of sand 
and gravel which divides the Boulder Clay into two distinct 
parts. At the base of this bed of sand is a series of intermittent 
springs (the chief source of the Fylingdales water-supply) the 
constant action of which is to undermine the heavy super- 
imposed beds. Thus, aided by the wet weather, huge masses 
of the Upper Boulder Clay and Middle Sands have slipped 
Naturalist, 
