18 
DE RANGE : THE YALE OF CLWYD CAVES. 
cave on the 11th of October. Three sketches were then taken, show- 
ing successive stages of removal of the blocks. The north joint in 
the limestone is seen in Fig. 4, on the west side of it are masses of 
Fig. 4. 
a. Limestone wall, joint face. 
b. Overhanging Bolid limeBtoue. 
c. Loose masses in Drift. 
d. Large block. 
e. Pipe of sand, against block d. 
f. Bone earth. 
g. Sand. 
h. Gravelly Boulder Clay. 
i. Boulder Clay. 
fallen limestone, now separated from it by a vertical pile of dark 
chocolate-coloured clay, with pale green fragments, about 4 inches in 
width. Examining the blocks more closely with Robert Williams, who 
was foreman of the workmen through the wdiole of the investigation, we 
very cautiously removed several, and found them to be imbedded in 
the ordinary brick red clay, with occasional erratics ; further removal 
of the large blocks disclosed a band of washed yellow sand, which 
could be traced round from the north joint westwards, over the large 
tumbler" before referred to, and over the vertical sand pit also 
