IN THE ISLE OP PORTLAND AND AROUND WEYMOUTH. 



35 



the beach to the northward, we find it passes under a light-coloured 

 loam with seams of angular debris, succeeded by a mass of angular 

 debris, chiefly of the local rocks (fig. 2). 



On the east cliff the relation of the several deposits is not well 

 shown. Still the order of succession is sufficiently apparent, and 

 near the Sand-holes the section is as under (fig. 3). 



Fig. 3. — Raised Beach, with overlying angular land-debris, ham, and 

 sand, near the Sand-holes, east side of Portland Bill. 



d. Angular rock-debris, 5 feet 



i! 



d'. Loam with land-shells and j -vfe^^^J^S 

 layers of angular debris, < ""^^ 

 6 feet I 



e'. Sand, If foot 



e. Raised beach, 3i feet 



Cliff of Portland Rocks, upper 

 surface waterworn. 



Level of present beach. 



It is, however, on the west cliff that the finest section is exposed. 

 Proceeding north-westward from the Bill, the beach is seen to pass 

 under the loam with the overlying rubble-bed before mentioned. 

 The loam varies in thickness from 10 feet at the northern end, to 

 nought at its southern end, and contains subordinate seams of the same 

 angular debris, giving it an appearance of rough stratification. In 

 this loam I found, in places, seams containing considerable numbers 

 of land and freshwater shells, but only of the few following species 

 (determined, with the others, by Mr. Gwyn Jeffreys) : — 



1. Limnaaa peregra, Miiller. 



2. truncatula, Midi., var. spira 



producta. 



3. Li max agrestis, Linne (shields). 



4. Succinea oblonga, Draparnaud. 



5. Pupa marginata, Drap. 



I found only one small fragment of bone, and derived (Jurassic?) 

 specimens of a species of Gyihere. 



But the most interesting part of the section is that exposed just 

 beyond the point to which the quarrying has been carried, and where 

 the beach ends by the side of a large fissure which runs inwards 

 from the shore. 



On the surface there is nothing to indicate any change, the ground 

 continuing its gradual slight slope from north to south. Descending, 



d2 



