56 DAKYNS : (iLA(^IAL PH KXO.M E.VA OF WHA HFEDA LK. 
glaciated. The deposit also contains fine stratified sand, beauti- 
fully false-bedded, round whicli the boulder drift seems to wrap ; 
but the section is not quite clear. Farther down stream there 
is a similar angular deposit. Tliere are plenty of rounded stones, 
but the characteristic is angularity. 
Pickles Gill, above its junction with Tom Taylor Dike, 
is full of drift, consisting of angular blocks and pebbles of grit 
and limestone ; the pebbles are mostly of hmestone, and the 
Hmestones are smoothed and scratched. 
It is not necessary to give any more details of sections, 
as it would be merely a repetition of what has been already 
said. 
The general result is this — that the boulder beds vary from 
a true boulder clay to a stony mass ; that this consists some- 
times of a heap of angular fragments, while at others it contains, 
a large number of pebbles ; tliat in tlie latter case, on the Mill- 
stone Grit area south of Grassington, the larger portion of the 
pebbles are of hmestone ; and that the limestones are generally 
scratched, the grits but rarely. Evidently the reason why the 
greater number of pebbles are of limestone is that the limestones 
have come a greater distance. 
Further, the true glacial boulder beds are mixed up with 
finely stratified sand and gravel. 
Lastly, well water-worn gravels, containing large boulders 
and angular blocks, line the valley sides in terraces, like ordinary 
river terraces. This makes me think that tliere is no real distinc- 
tion to be drawn between the older river gravels and the water- 
worn boulder gravels, which are generally set down to the Glacial 
Period as something quite sui generis. I believe, on the contrary, 
that the ordinary river gravels run back to Glacial times and 
gradually merge into the deposits of that age. 
As I have already described the occurrence of Silurian 
boulders in Wharfedale, I will merely say that these boulders, 
which are like rocks that occur in place in Ribblesdale, are con- 
fined to the portion of the valley between Chapel House Lodge 
and Burnsall ; that is, all that I have met with are below Chapel 
