GRACE : THE GLACIAL GEOLOGY OF FURNESS. 
407 
In the Silurian area of Furness the highest summits do not reach 
much above 1000 feet, so that any evidence found there probably does 
not belong to the maximum period. 
The Period of Valley Glaciers. 
The period of valley glaciers, which succeeded that of maximum 
glaciation, is that part of the Glacial Period which has left most abund- 
ant data for examination. For some time after the maximum period 
the surface level of the ice was high enough to admit of cross-streams 
from one valley to another, and we have evidence of many of these 
high level streams. But eventually the ice would be confined entirely 
to the valleys, and the direction of motion would coincide with the 
present valley bottoms. The chief valley glaciers in Furness were 
the Duddon, the Lickle, the Coniston, the Rusland and the Winder- 
mere. The glaciation of some of these valleys has been described 
previously, and we propose to confine our paper to details which appear 
to be new. On account of the necessity for compression we are com- 
pelled to make our observations somewhat disconnected. 
The details of the glaciation of the Duddon Valley have recently 
been described by B. Smith.* It is noteworthy that the floor of this 
valley is rock all the way to Duddon Bridge, so that probably the 
glacier which occupied its lower part was comparatively small. 
The Lickle Valley Glacier drew its supplies from several sources. 
A considerable stream of ice came from Torver High Common by way 
of the Appletreeworth Valley, including, during part of the time, a 
glacier nearly a mile wide which can be traced from above Conistor. 
along the depression between Bleaberry Haws and Walna Scar Fell, 
and also one from the Goat's Water Combe. The present valley in 
which the Appletreeworth Beck runs is continued northwards as a 
dry valley to Ash Gill, and has apparently conveyed a considerable 
stream of water along the margin of the ice from the mouth of the 
Goat's Water Combe into the Lickle Valley. A glacier quite as large 
came over the Dunnerdale Fells at 1300 feet and down the Upper 
Lickle Valley, which is a U-shaped glaciated valley with a V notch in 
its base, down which the present river flows. A third stream came 
over the Fells to the south of Caw, but a fourth down the valley in 
which Hoses stands seems to have found the Lickle Valley so full of 
* Qimrt. Journ. Geol. Soc, Vol. LXVIII. (1912), p. 408. 
