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GRACE : THE GLACIAL GEOLOGY OF FURNESS. 
{b) The 200 feet Lake. 
A number of fragmentary terraces, composed of well worn gravel, 
occur along the eastern side of the Estuary about the 200 feet contour. 
The best of these can be seen at Gargreave and Bank End. Stronger 
evidence of the permanence of the lake at this height is furnished by 
a number of deltaic deposits, where streams from branches of the 
Crake glacier entered the lake. These are : — (1) In the valley where 
Hallstead Farm now stands, about half a mile south of Grisebeck. 
This appears to have been formed by drainage from one of the outlets 
of the Gawthwaite cross valley. (2) In the valley above Grisebeck 
where the other outlet from the Gawthwaite valley discharged. (3) In 
the Ellermire valley where the Subberthw^aite cross valley drained 
into the lake. (4) A little north of Hill where a small branch from the 
Subberthwaite valley drained into the lake at the most northern 
point at which we have found any evidence of the 200 feet phase. 
These deltas are more or less fan-shaped. They are conspicuously 
stony at the tops, most of the stones being almost uniform in size, 
with their largest dimensions between 3 inches and 6 inches. Some 
of them are rounded but the majority are angular. Further down the 
delta the slope of the surface increases, and the stones become fewer and 
eventually give place to a fine alluvium quite free from stones. These 
deltas are most easily discernable in winter, when the soil is bare. 
The first overflow of the 200 feet lake was by a channel (No. 2) on 
the west of Housethwaite Hill leading into the Long Bank Wood side 
of the Hagg Gill Channel. The further course would then be the same 
as No. 1. Later shrinkage of the Irish Sea Ice opened a channel (No. 3) 
a little to the west of No. 2, which leads at 180 feet into the Goldmire 
Valley. It is doubtful whether this marks more than an intermediate 
stage between the 200 feet and the 100 feet phases. 
The area occupied by the 200 feet lake was probably quite small 
and confined to the eastern side of the estuary. There is no evidence 
of it on the western side, and a moraine near Fell Gate suggests that 
the 200 feet lake did not reach further north than Hill. 
(c) The 100 feet Lake. 
The area of the 100 feet lake must have been much greater. It is 
almost certain that it included a large area in the Steers Pool Valley, 
but in the absence of definite evidence it is not easy to decide whether 
any of the Lickle Valley was clear of ice. The Duddon Valley was most 
