o94 MR. A. R. DWERRYHOUSE ON THE GLACIATION or | Aug. 1902, 
(5) Glacial Lakes and Drainage-Channels. 
The valleys tributary to Weardale having been, without exception, 
occupied by ice, no glacial lakes were produced, and, as a result, there 
is a complete absence of the dry valleys so common in Teesdale. The 
only case in which the drainage was abnormal was at the head of 
Bedburn Beck, where the tributary known as Fuden Beck received 
the waters from the lake in the valley now occupied by Little 
Eggleshope Be+k, on the Teesdale side of the watershed (see 
p. o74). 
LY. Tue Vary or tHE Tyne. 
(1) Topography and Structure. 
The South Tyne 1ises on the eastern slope of the Cross-Fell 
range, in the neighbourhood of Yad Moss. This is practically 
in the drainage of the Tees, the watershed being flat and composed 
of Drift and peat, and the South Tyne being actually connected with 
the Tees by channels of sluggish water in wet seasons. 
The South Tyne flows northward down Alstondale, receiving 
important tributaries on both banks from the northern portion of 
the Cross-Fell range on the west and from Alston Common (75) on 
the east. It continues to flow northward, until it reaches the line of 
faulting which cuts off the northern end of the chain, and then turns 
abruptly eastward, in which direction it continues to flow to its 
junction with the North Tyne, 25 miles north-west of Hexham. 
Near the bend a small tributary, Tipalt Burn, comes in on the 
lett bank. This rises about 6 miles to the north- -west of Halt- 
whistle, and for the first part of its course flows in a south-westerly 
direction towards Gilsland; it then turns down the broad valley 
which carries the Newcastle & Carlisle Railway, and flows south- 
eastward to join the South Tyne about 13 miles above Haltwhistle. 
Between Haltwhistle and Hexham the River Allen, formed by 
the junction of the East Allen and West Allen, joins the Tyne on 
the right bank. 
The North Tyne rises in the Cheviot Hills near Deadwater, and 
flows in a general south-easterly direction to its junction with the 
South Tyne near Hexham. The main river, formed by the junction 
of the North Tyne and South Tyne, then flows in a general easterly 
direction to the sea at Tynemouth. About 3 miles below Hexham 
the Devil’s Water comes in on the right bank, and the River 
Derwent joins the main stream on the same bank 3 miles above 
Newcastle. 
The drainage-system of the Tyne is entirely excavated in the 
rocks of the Carboniferous System, which are penetrated in places 
by the Great Whin Sill. The watershed between the basins of the 
Narth and the South Tyne corresponds approximately with the line 
