1916.] MOULIN HUET AND ICART CAVES. 333 



That opening gave an outlet to the water which drained 

 through the soft rock, and as the pieces of rock fell into the 

 cavity from the roof and sides the cave became larger and 

 larger. This process was intermittent, but at the time of the 

 25' beach the cave had become large enough for the sea to 

 wash along the whole length, but the cave was still a low one, 

 being then about 10 feet high inside. The floor was six feet 

 higher than at present. 



2. — The second stage sets in with the sea at the 25 v level. 

 The wash of the sea now removes all the fallen rock, but a 

 period sets in during which there is a greater rainfall and the 

 soft rock decomposes more rapidly, and the rock-falls become 

 greater and the cave larger. 



The cliff is all washed away by being undercut and the 

 cave becomes an open gully into which the sea makes a clean 

 breach, taking into the gully and as often removing again a 

 vast mass of pebbles, which in passing in and out scored the 

 sides as now seen, in the end it had worked out a platform 

 which was the equivalent of the Divette one and on the 

 platform it left a mass of pebbles. The sea level was a 

 falling one, and as soon as it fell below the level of the then 

 small opening all changes ceased. 



The decay however continued inside, and thus we find 

 fallen rock on the top of the layer of the 25 N beach. 



3. — The fall of the sea level ceased and a rise succeeded 

 which continued until a new level of 52 v was reached. 

 During the rise which represents a fall of the land, a new 

 cliff was forming and probably the whole of the caves was 

 covered over. 



The arrest of the fall of the land gave time for the sea 

 to work out the third stage. It washed away the cliff rubble 

 from the top of the old gully, and then found a way into the 

 cave from above, displacing the rubble to a distance down and 

 ultimately filling the top with beach stones. 



On the rise of the land until the present level was reached 

 the cave found itself again covered with a new " Head." 



Now begins the work of opening the cave once more, but 

 this time from a lower level, and the soft rock floor is removed 

 and all the fallen debris washed out as far as the sea could 

 reach, leaving the cemented pebbles on the roof and sides. 

 But the land is still sinking and the excavation of the cave is 

 still in progress, and the whole of the pebbles will ultimately 

 be removed. 



In short, the caves have been filled at two separate levels. 



