33 



Glacial Clay therefore this part of the Clialk scai-p existed in 

 nearly its present position. 



At Barrington Hill a thin bed of intercalated loam appears 

 in the road- cutting about three-parts of the way up from the 

 Linton side. Another remarkable feature of this hill is that its 

 summit is capped with a patch of later gravel, which forms one 

 of a series of outliers extending along the spur of hilly ground 

 to the N.W., toward the Gog-Magog Hills. These deposits how- 

 ever, inasmuch as they are superior to the Upper Glacial beds, 

 I will leave for future consideration. 



Returning now to our central position at Balsham, we find 

 there are smaller spurs and outliers of Boulder Clay westward 

 and northward of that place. One of these caps the hills near 

 Gunners Hall, and a smaller patch within the brow of the long 

 valley to the east is covered by later gravels and loams. 



A long spur runs out across Balsham Ditch to the Trigono- 

 metrical Station near Congers Well, the height given here 

 being 346 feet. Returning along the northern edge of this 

 spur, which is bounded by a long, deep, and dry valley running 

 northwards from the hill slopes between Balsham and "West 

 Wratting, we find the Boulder Clay traceable through the latter 

 village and thence skirting the high ground by Weston Colville, 

 Brinkley and Westley Waterless. At all these places it rests 

 directly upon the Chalk without any intervention of gravels, 

 sands or loams. From Westley Waterless it appears to trend 

 eastward, south of Dullingham, Stetchworth, Wood Ditton and 

 Saxon Street, and the level of its boundary seems to be at the 

 same time declining northwards, as indeed it has been along the 

 whole line we have been followins'. I have not been able to 

 obtain much information about this part of the county, but 

 Boulder Clay occurs again on Warren Hill east of Newmarket, 

 and may be seen in a large pit near the road, where about 20 feet 

 of buff-coloured chalky clay is exposed. It does not cap the top 

 of the hill, which is 267 feet high, and where the bare chalk is 

 covered only by about four feet of sandy soil, so that the clay 

 would not appear to rise above 250 feet. From this point we 

 look northward over the lower plateau between Icklingham and 

 Brandon, where the Boulder Clay sinks under newer gravels and 

 sands. 



