580 MR. A. R. DWERRYHOUSE ON THE GLACIATION OF [Aug. 1902, 
Tinklers Allotment (21), 1250 to 1500 feet ; but on Hardberry Hill 
(22), at a height of 1742 feet, there is very little, if any, Drift. On 
the east side of the stream, at the limestone-quarry, there is about 
20 feet of Drift above the limestone. The boulders in Hudeshope 
Beck include limestones, shales, and sandstones from the Carboni- 
ferous Series, basalt, Millstone Grit, and green andesites of the 
Borrowdale Series. 
The andesites appear to be entirely confined to the 
eastern side of the Dale, where “they aremiaunle 
plentiful. 
The valley of Great Kggleshope Beck is in its upper part (above 
the lead-works) apparently free from Drift. But at the junction 
of the stream with Little Eggleshope Beck there is an enormous 
accumulation of bluish Boulder-Clay containing many boulders, 
both large and small, of the following rocks :—-andesite (Borrow- 
dale Series), Carboniferous Limestone, Millstone Grit, Carboniferous 
sandstone, and basalt (Whin Sill). Many of these boulders are 
striated. This sheet of Drift extends up both becks. In the case 
of Great Eggleshope Beck there is no great thickness, and it dis- 
appears entirely before reaching the lead-works. 
In the valley of Little Eggleshope Beck there is more Drift, and it 
extends up to a point 17 miles above the junction of the streams. In 
the upper part of this valley, in the neighbourhood of the California 
Lead-Mine, the Drift is represented only by a few scattered 
pebbles of Whin Sill (which does not occur in setu in the valley). 
The thick mass of Drift extends from the junction of the streams 
continuously across Cowlake (23), 1114 feet, and ends in the cliff 
cverhanging the Tees, in the neighbourhood of Stotley Hall. Ina 
southerly direction it extends to, and is continuous with, similar 
Drift in the valley of Blackton Beck. The surface of the Drift is 
undulating, its elevation varying from 1100 to 1250 feet above O.D. 
In Blackton Beck the Drift runs up to Blackton Head, and is 
connected by scattered boulders with that of Spurlswood Beck and 
Rowley Beck, both in the Wear drainage-basin. 
There are patches of Boulder-Clay containing Teesdale rocks on 
various parts of Woodland Fell (24) and Langleydale Common (25). 
It is now necessary to consider the Drift of that part of the area 
which was invaded by the ice from Kdenside. Here we at once 
meet with a type of material which is entirely different from that 
of any other part of the district. 
So far, the Drift described has been principally derived from 
Carboniferous rocks; but in Lunedale and Balderdale the deposits 
are distinctly red, owing to material derived from the Trias and 
Permian of the Vale of Eden. As Mr. Goodchild has shown, the 
Drift bearing Shap Granite and Triassic material can be traced 
to the summit of the upper Pass of Stainmoor, and this Drift is 
found over the whole of the country between Lunedale on the 
north and the Greta on the south. 
At the head of Lunedale there is very little Drift, the slope of 
