Vol. XV.] 
[Part I. 
PROCEEDINGS 
OF THE 
YORKSHIRE 
GEOLOGICAL AND POLYTECHNIC SOCIETY. 
Edited uv VV. LOWER CARTER, M.A., F.G.S., 
AND WILLIAM CASH, F.G.S. 
1903. 
THE GLACIER LAKES OF CLEVELAND. 
BY PERCY FRY KENDALL, F.G.S., 
LECTURER ON GEOLOGY AT THE YORKSHIRE COLLEGE. 
In pre-glacial times Yorkshire seems to have stood at a 
"Considerably greater elevation than at present, for drift-filled 
valleys have been proved to descend in many places below 
sea-level. In the great valley between Newcastle and Don- 
caster there is an old drift-filled hollow, which at Gateshead 
is 140 feet below O.D. South of the Tees borings reveal a great 
depth of drift until the line joining Northallerton and Bedale 
is reached, where it becomes thin over an old watershed, but 
tliickens again southwards, and the rock floor of the valley 
is 74 feet below O.D. at Cawood, and 170 feet at Barn by Dun, 
near Doncaster. In the Vale of Pickering drift deposits reach 
a thickness of 107 feet, and the rock floor from Filey to Malton 
Hes below sea-level. This evidence points to a long period of 
I)re-glacial elevation, but, on the other hand, borings in Holder- 
ness show a plain of marine erosion, with blown sand banked 
against the old chalk cliff, at practically the present level. 
