in the Drift of the Valley of the Avon. 223 
necessary to enumerate those spots at which flint implements 
have already been discovered ; but it should be borne in mind that 
these implements probably exist in the valley wherever gravel and 
clay of this age occurs, but from various accidental circumstances 
have not yet been brought to light by the diligent search of the 
geologist. Even since this was written, Ringwood has by the per- 
severing industry and zeal of Mr. James Brown of Salisbury, been 
communicated to me as a fresh locality for flint implements. Com- 
mencing at the village of Lake! where the higher level gravel has 
afforded several very characteristic implements, they can be traced 
down the valley in similar deposits at Bemerton, Highfield, Milford 
Hill, Britford, Ashford and Ringwood, extending in the adjoining 
gravels at Bournemouth and Hill Head, over an area of about 
40 miles in length. 
The scattered drift deposits are best classified according to the 
relative heights at which they stand above the level of the present 
rivers; it is found that they arrange themselves into three distinct 
groups, and consequently have belonged to different periods of 
_ time. The highest are represented by the gravels of Lake, Bem- 

erton, Milford Hill, Britford, Ashford, &c.; the middle period 
by the large deposit of brick-earth at Fisherton; and the third 
by the gravel which is spread evenly over the bottom of the 
valleys of the Avon, Nadder, and Bourne. 
; The gravel of Milford Hill may be taken as a remarkably good 
representative of the deposits of the higher level age. It is com- 
posed of the ordinary sub-angular chalk-flints, a rather large per 
_ centage of fragments of green-sand chert, a few well rolled tertiary 
pebbies,and some small blocks of saccharoid sandstone, also of tertiary 
origin. These materials are blended together, with a variable 
proportion of sand and stiff clay, and are stained pretty uniformly 
_ of a dark ferruginous colour. Many of the chalk-flints are of large 
F. size, with sharp well-defined angles, and present scarcely any 
- marks of violent rolling or water wearing. Milford Hill is a low 
_ chalk spur placed immediately above the point where the Avon 

es eae ae eee ee ee 
_  1This interesting discovery at Lake was made by Mr, Tiffin, Jun., during 
the Autumn of last year. 
