ON THE CAE GWYN GATE. 



135 



of a very considerable settlement, probably not less than 4 feet, in 

 the section shown in the lower left-hand corner of figs. 2 and 3. 



Instead, therefore, of the less satisfactory task of proving that 

 there were in the district many well-known processes connected 

 with subterranean denudation which might explain the superposition 

 of the marine drift upon the bone-earth, each of which had played 

 a part in producing the results observed, we have now the clearest 

 evidence as to the exact manner in which it has all been brought 

 about, namely : — 



That the marine drift was deposited before the occupation of the 

 cave by the animals whose remains have been found in it ; 



That at the time of the occupation of the cave the upper opening 



Fig. 8. 



-Plati of Cae Gwyn Gave. (Scale 34 feet to 1 inch.) 



a. Entrance to cave. 



h. Break in the side of cave known as " Upper Opening," where the bones kc, 

 were found outside the then existing cave. 



c. Cutting made after discovery of the upper opening b. 



d. Debris of roof and wall of cave overlying bone-earth. 



e. Extension of cave to the north along which water now drains away under 



the drift, 

 /indicates the point of view in fig. 2. 



(?), fig. 8) now seen did not exist, but the animals got in by the 

 other entrance (a, fig. 8) ; 



