Its Bearing on Glacial Geology: : Il 
High-Level Glacial Gravels. 
At a level of about 1600 feet above O. D. on the edge of the 
Serees overlooking Wast Water (see Fig. 1, p. 17) is a deposit of sub- 
angular gravel so “far as I could make out entirely composed of the 
rocks of the volcanic series. It is about 8 feet thick where I first 
saw it, and can be traced along the summit of the Screes up to 
nearly 2000 feet above O. D. Unlike the Drift of the valleys 
already described, these gravels show marks of glaciation in the 
shape of flattened surfaces, strize, and scorings, at all angles. 
I brought quite a number of specimens away with me. Many of 
them have been very much weathered, as might be expected from 
their exposed situation, but still, even where the stone is much 
eaten into by surface decomposition, the characteristic glacial shape 
is often preserved. These gravels show on the north-west edge of 
the Screes, evidently through the falling of the cliff-rock on which 
they repose, exposing from time to time fresh surfaces. The rain 
washing away the smaller material in which they are imbedded, 
leaves the upper surface of gravel clean and conspicuous. The 
largest striated stone I observed was 7 inches across, and flat on 
opposed sides. There is no doubt that the flat surfaces are largely 
due to jointing, and it is on these plane surfaces that the stones 
have been pushed along, polished and striated. The smallest gravel 
is often striated all over, and it is quite evident that the original 
shape of the stone influences considerably its mode of glaciation. 
At Miterdale Head there is a ravine or wash-out in the Drift 
with which this part of the mountain is deeply covered. Its level, 
where I examined it, is from 1400 to 1500 feet above O. D. The 
Drift is here of a very similar character to that on the summit of 
the Screes, but hardly so much glaciated. On digging into the 
deposit, a little below the surface-wash, it appeared to be a grey Till. 
I think that the Drift on the Screes is probably similar in nature. 
I took samples of the loamy matter in the Screes Drift, as also in 
that at the head of Miterdale. A mechanical analysis by means of 
sieves yielded the following results. 
TILL FROM THE ScrREES, Wast WATER, 1600 reer ABovE O. D. 
Weight before washing 6 ounces. 
Percentages. Ounces. 
HED 55 coc CHIBI TN ey Tne, See hee BETO 
“0605 pisoh ess 5 oe Par 02416 
SOOM LEY ate Wits Maes soy cn OPBOS 
- 2) See ennee nD ASSCO MNT a 5 », (fine sand) 1-250 
LOS eer ese eteiaic.. | ocala 9 (Clay) OZ938 
1-000 6-000 
TILL FROM RAVINE NEAR MrrerpALE Heap, 1485 reer apove O. D. 
Weight before washing 6 ounces. 
Percentages. Ounces. 
2002 ae eee em CAUCHILEIN >, INCH@THeS HNN anemone) 
SOS) Gaal Sab as ca 39 see eee == 0°888 
Sibi ah Wes) eS ae vee vee 0°666 
pl (omme een DASSCOMMNT 5G », (fine sand) 1-042 
COU kcc Ti.  .Meyees OE(Clay) is 0208 
1°000 6°000 
