WESTLETON BEDS TO TEOSE OF NORFOLK, ETC. 127 



Lower down the hill the yellow sands of the Crag crop out. 

 The gravel has the well-marked characters of the Westleton 

 Shingle, its approximate composition being as under : — 



per cent. 



1. Small flint-pebbles 30 



2. White quartz-pebbles 25 



3. Subangular flints 23 



4. Subangulanr fragments ol' chert and ragstone 12 



5. Pebbles of light-coloured sandstone and quartzite, and 



Lydian stone 10 



100 



Mr. F. J. Bennett has noticed a very similar section at Elmsett, 3 

 miles to the north-west of Burstall, where the Boulder-clay overlies 

 a "rather coarse sandy gravel, with pebbles of quartz and of quartzite, 

 about 2 to 10 feet," overlying a " fine buff rather clayey sand " *. 



The railway-sections in this intermediate district afforded little 

 information respecting the Westleton Beds. The Norwich line, 

 between Ipswich and the valley of the Ottley stream, passes almost 

 exclusively through thick Boulder-gravels and clay very much dis- 

 turbed and deeply eroding the underlying beds ; whilst the Yarmouth 

 line, between the Orwell and the Deben, passes through Glacial 

 loams, with but little gravel or Boulder-clay, overlying the Bed Crag 

 and unfossiliferous sands. 



My notes, I regret to say, are not sufficiently detailed to give a 

 definite account of the deep cutting on the northern side of the 

 tunnel at Ipswich on the London line. This section, unlike that on 

 the southern side of the tunnel, which was through a mass of 

 Post-Glacial Drift, exposed : — 



feet. 



Light-coloured sands with seams of gravel in horizontal layers 40 



Eed Crag with much false-bedding t 20 



Dark brown London Clay. 



But though I failed to note the exact composition of the gravel, 

 my belief is that this bed belongs to the Glacial Series. The 

 next cutting (fig. 3), where the line passes under the London Road, 

 shows how extensive the denudation accompanying the advance of 

 the Boulder-clay has been. 



Fig. 3. — Section on the liaibvaij near Ijiswich. 

 b\ 



a. Ochreous gravel, b. Boulde?--clay. h\ Light-coloiu'ed gravel. 

 c. Eed Crag. 



^ ' Geology of Ipswich/ &c., p. 77. 



t Here, as at the Kyson Cutting, a layer of Septaria divides the Ked Crag 

 from the London Clay. 



