JOWETT A>D MUFF : GLACIATION OF BRADFORD, ETC. 213 
more than seven feet thick, containing rounded pebbles of Mill- 
stone Grit, shale, gannister, and chert, extends above the 1,250 
foot contour-hne on the hill-slope to the south-west. The block 
therefore lies well within the glaciated area. Supposing the 
block to have weathered out before the Glacial Period, it is 
inconceivable that the glacier should have passed over it and 
left it in its original position. On the other hand, that a bed of 
grit over 21 feet thick has, with the exception of the Hitching- 
stone and some smaller boulders lying near it, been completely 
removed from the surface in post-glacial times, is contrary to 
all the existing evidence of the amount of weathering since the 
Glacial Period. The derivation of the Hitchingstone as a 
boulder from either of the beds mentioned above does not involve 
a transport of more than a mile, nor an uplift of more than 50 
feet. 
Boulder-clay with limestone is found at the head of Lumb 
Clough, above Sutton. Half a mile north-west of Braithwaite 
on the northern slopes of Neivsholme Dean, yellowish sandy 
boulder-clay runs in low ridges from X.W. to S.E. down the 
hill side. The bottom of the valley contains much boulder-clay, 
which also extends up the tributary valley of Xewsholme Beck. 
A section near the Baptist Chapel (Slack Lane) exposed blue 
boulder-clay containing striated boulders of Carboniferous 
Limestone and Millstone Grit, together with pieces of shale. 
Below the junction of Xewsholme and Xewsholme Dean Becks 
the boulder-clay is overlaid by coarse gravel and current-bedded 
sand. There is little drift in the upper part of Xewsholme 
Dean Beck, except near its head, where clayey gravel is exposed 
in some stream sections. It contains some pebbles of limestone 
and chert. Gravel two feet thick is exposed on the roadside 
about 100 yards S.E. of Morkin Bridge. A thin covering of 
boulder-clay spreads over the flatter part of Keighley Moor to 
the west of Broad Head. Sandy boulder-clay with chert, 
grit, gannister, and fragments of shale extends up to the 1,200 
feet contour line near Clough Hey Reservoir. The ridge to 
the south, overlooking the Worth Valley, is bare of drift. 
In the Worth Valley the boulder-clay forms a thick deposit 
along the floor and the northern slopes, A boring put down 
