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KENDALL: THE (JLACIEK LAKES OF CLEVELAND. 
(3) The Coast Lakes. 
The line of watershed extending from the head of Iburndale 
round Sneaton Low Moor marks the beginning of a drainage 
system displaying many remarkable anomalies. A narrow 
coast-strip of countr^^ extending from Robin Hood's Bay on 
the north to Hunmanby on the south and varying in breadth 
from 100 yards up to a maximum of about three miles, drains 
in a general way down the normal slope of the land into the sea. 
(Plate XIV.). But, behind this, at a short distance, seldom 
more than three, and never more than six miles, there runs a 
great gorge which receives all the drainage of the hinterland 
^nd carries it away to the south, and finally westward, through 
the Vale of Pickering, into the Ouse and Humber drainage. 
Thus it is that streams, rising within two miles of the sea at 
Robin Hood's Bay or Peak, pass into a system which enters 
the sea at Spurn. 
In tlie initiation of this drainage, the effects of an ice-sheet 
which sliut the seaward ends of the valleys is clearly traceable, 
just as was the case in Northern Cleveland, but with this differ- 
ence, that in the northern area the lake-overflows were rarely 
cut to so great a depth as permanently to deflect the larger 
drainage channels. On the eastern coast the ice invasion was 
not so extensive, and the overflows were all of the marginal 
type. Some of the cutting was over high and prominent water- 
sheds, - but more often existing drainage-lines were followed 
and deepened. ^loreover, the effects were cumulative, as one 
aligned sequence remained in occupation for a long period, 
and an increasing volume of water was brought to bear upon 
just those regions where the greatest barriers were encountered, 
namely at Hackness and Suffield Moors. It will be further 
shown that at these two places the physical features of the 
country were such as to secure a stable position of the overflows 
during considerable oscillations of the ice-front, so that per- 
sistent cutting on one line of overflow would take place, instead 
of the excavation of a parallel series of successive channels 
such as occurred in other areas. 
Iburndale Lake. — This lake, though standing isolated in 
a, large measure, forms tlie first of the five series of lakes that 
