360 PKE-GLACIAL DEPOSITS. 



stages of disintegration. These intermediate beds can be 

 traced in most of the quarry cuttings, and there would be no 

 object attained by detailing a greater number as the earnest 

 student will have no difficulty in finding them. 



Instances of the occurrences of passage beds could easily 

 be increased as they exist in many places. I think, however, 

 that the instances I have given will suffice and that I may now 

 conclude the 1st Stage of the Pleistocene Period by a short 

 resume of the order of events as shown by the Guernsey 

 evidence. 



1st. — The period began with elevated land and a 

 rising sea-level. 



2nd. — Aerial rubble land margins, the result of 

 weathering, was attacked and washed away except small 

 residues. 



3rd. — The rising sea, acting for a very long period 

 and rising very slowly, wore out rock platforms and 

 deposited a line of beaches all around the island on the 

 then 25 feet contour, which differs in places from the 

 present sea margin, but it is nowhere far from it. 



4th. — The sinking of the land was arrested, giving 

 time for the 25 feet beach to increase the erosion of the 

 platforms, causing that beach to limit its erosion of 

 the land. 



5th. — The sea erosion being arrested a small accumu- 

 lation of land rubble, clay and gravel was formed. 



6th. — The sea-level retired some 10 to 12 feet. The 

 submerged beach was formed and a land surface estab- 

 lished over the 25 feet beach. 



7th. — The sea then rose to the 50 feet elevation 

 comparatively quickly, leaving a trace of passage beds to 

 mark its progressive rise. 



8th. — The 50 feet beach was then eroded and the 

 contours modified. Although less important in extent 

 and duration, yet this beach was the result of a longer 

 period of sea erosion than those which follow. 



9th. — The rapid (comparatively) advance of the sea- 

 level to the upper beach marks and the gradual disappear- 

 ance of the island under the sea. 

 Thus was completed the pre-glacial submergence. 

 It may be of interest to our members for me to outline 

 the little Ave know of the inhabitants of the island during the 

 beach period. We have the fact that the beaches have 

 yielded pre-Chellean and Chellean implements, all of which 

 belong to a pre-Mousterian type. Further than that type it 



