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CAVES AND CAVE DEPOSITS. 183 
We have now the clearest evidence as to the exact manner in 
which it has all been brought about. 
The marine drift was deposited before the occupation of the 
cave by the animals whose remains have been found in it. 
At the time of the occupation of the cave the upper opening 
(4, fig. 1) did not exist, but the animals got in by the other 
entrance (a, fig. 1.) 
Against the wall of the cave, where it approached nearest to 
the face of the cliff, the drift lay thick, as we now see it close 
by (fig. 2.) 
By swallow-hole action the cave was first partially filled, and 
then the thinnest portion of its wall gave way, burying the bone- 
earth below it, and letting down some of the drift and newer 
superficial deposits above it. 
Fic. 2. 
The left-hand portion represents the section seen along the north-west face of 
the cutting in September, 1887, and shows the festooning of the upper 
part of the superficial deposits at the margin of the swallow-hole. The 
right-hand portion is the section along the north-east face as exposed by 
the excavations carried on in October following. 
(Scale 20 feet to 1 inch.) 
S. 30° W. N. 30% E. N.W. 8.E. 
a. Head, Rainwash, Run-of-the-Hill. 
6. Moved drift ; marginal portion of that which slipped into swallow-hole, 
and finally closed the upper opening. 
c. Cave-deposits. 
d. Angular limestone; broken-down wall and roof of cave. 
e. Marine Drift. 
Jf. Shell-bed in drift. 
g. Limestone. 
This is the section as seen by GENERAL Pitt-RIveRs and 
Dr. JoHNn Evans in September. This face was afterwards cut 
back a little, but still, in October, the section showed the margin 
of the looped drift cutting off the shell-bed and the surface-soil 
falling with it in towards the swallow-hole The section facing 
the observer, looking a little east of north along the length of 
the pit, showed this surface-soil about 4 feet deep, moved drift 
4 feet deep, red clay a few inches; this red clay was very irre- 
gular and consisted chiefly of the earthy residuum of the 
decomposed limestone, corresponding to some of the clay with 
flints of the Chalk districts. ‘The surface-soil and moved drift 
