ON THE CAE GWrN CAVE. 



125 



present surface to the sea. Ledges and points that a man could 

 stand on projected straight out from the rock-face just where the 

 waves and pebbles would have hammered them all away. The 

 character of the rock is well shown in the sketches and photograph 

 (see figs. 2, 3, and 4). Funnel-shaped cavities (as seen in fig. 2 



Yig. 3. — Vieiu of the upper opening into Cae Gwyn Cave, looMng 

 north. (From a water-colour sketch by Mrs. M'Kenny Hughes.) 



above the left elbow of the man in the centre), tapering down or 

 opening out both ways like an hour-glass, told of swallow-holes 

 under a land-surface, rather than blowholes from a sea-cave. The 

 fretted surface of the rock, the unctuous clay lining the holes and 

 fissures, the travertine plastering the walls of the cave and filling 

 the cracks, the lines of sand in the crevices, all pointed to chemical 

 decomposition and subterranean denudation only. 



As the result of such operations, it necessarily happened that 

 some of the drift had moved downwards without much change, 

 except the destruction by percolating water of any shells or frag- 



