388 THE MOUSTERIAN PERIOD. 



of the water, thus producing a series of deposits formed by 

 the washing of debris from high to lower levels. This theory 

 is not borne out here, but the deposits he describes can be 

 accounted for if two submergences, pre and post-Mousterian, 

 are admitted. 



We may, I think, take it that at least two submergences 

 have occurred and that a third, although not proved, may 

 reasonably be assumed. 



Several of the Continental writers also adopt the view 

 that the evidence of a post-Mousterian depression is proved 

 by the deposits of the upper clay (brick earth) ; we may 

 therefore consider that our evidence of a pre-glacial and a 

 post-Mousterian submergence is confirmatory. 



As regards the pre-Mousterian submergence which I have 

 formulated there is more room to doubt, for the evidence of 

 the deposition of the upper part of the boulder-clay on which 

 it rests may have been accomplished by means of w r ater flow- 

 ing from the melting ice. There is, however, this against it : 

 the deposits recognisable as such are stratified, as at Route 

 Isabelle, whilst the upper part of the boulder-clay is not. 



I prefer to leave this as undecided, but I think it quite 

 possible that evidence may be forthcoming to sustain my view. 



Stage 4. 

 THE MOUSTERIAN PERIOD. 



Although I have considered the two deposits of clays in 

 one part of this paper, it by no means follows that they were 

 deposited at the same time. All I wished to convey was that 

 the clays were both of the same character and had the same 

 causes, but I was particular in saying that they each rested on 

 eroded surfaces, and I now wish to prove that a period of time 

 of great length must have separated them. 



The first deposit gave us a boulder-clay with no Mousterian 

 implements, the second has yielded them in abundance. It 

 must be confessed that we were slow to admit that the 

 implements were Mousterian, but after the proof of Mousterian 

 man in Jersey we began to reform seriously our opinions and 

 some fortunate finds of Mousterian flints, identical with the 

 implements found in the Jersey caves, cast aside all doubt, 

 and now boldly assert that Guernsey also Avas the home of 

 this peculiar race, intermediate between two glaciations, and 

 this fact admitted gives our glaciations their places in time. 



Unfortunately, more from want of funds than want of 

 interest, our caves have not been worked with a view of their 

 contents establishing the facts, 



