450 



PKOCEEDIKGS OF THE GEOLOGICAL SOCIETY. 



deposit is met with, the position of which, however, is essentially 

 different from that found at Broomhill. From a careful survey which 



Plan of Gravel Hill, Brandon. 



4// 



+ Gravel-pits. — Height 90-62 feet, from A to B, taken from the level of the 

 river. Distance from the river 78 chains. 



I have lately made it is found to be 91 feet above the river, and very 

 nearly a mile distant from it at the nearest point ; it comprises an 

 area of from thirty to forty acres, occupying the summit of a hill 

 overlooking an extensive sandy plain, which at a short distance 

 merges in the great level of the fens. The bed of gravel here is 

 usually not more than 10 feet in thickness, and often less, resting im- 

 mediately upon the chalk ; and, as at Broomhill, the implements are 

 usually found at the bottom of it, and occasionally they lie upon the 

 chalk. As regards its composition, however, no less than its position, 

 this gravel differs greatly from that found at Brandon; the nodules 

 of flint are not so large, there is very httle of the broken chalk, and 

 the mass of the overlying sand is much less. 



By far the larger proportion (perhaps three-fourths of the whole 

 mass of gravel) consists of rounded quartzites, and a few jasper- 

 pebbles, while at Broomhill the proportion of these is hardly a 

 thirtieth part of the whole. In some spots, indeed, these pebbles 

 form a compact mass with hardly a single flint ; and under one 

 of these, at a depth of 6 feet, I procured a very well-shaped implement. 

 The implements here are not generally stained of so deep a colour as 

 those at Broomhill; and while many of them are of very coarse 

 workmanship, and much worn and broken, others are of excellent 

 forms, and as sharp and fresh as when flrst made, 



LaJcenheath. — The next deposit which I have examined is at Laken- 

 heath, Suffolk, distant three miles from the left bank of the river. 

 It is found on some high ground known as the Broom, between 

 Lakenheath and Eriswell, and is at about the same height above the 

 river, and of the same character as that at Gravel Hill, from which it 

 is separated only by a shallow valley. These hills are only two 

 miles and a half apart, and the beds which now cap them were 



