JOWETT AND MUFF : GLACIATlON OF BRADFORD, ETC. 211 
(8) About 350 yards north-west of Horncliffe House, on 
Bingley Moor and beside the footpath, a plane and smoothed 
surface of grit is striated from N. 55° W. to S. 55° E. The 
altitude is 1,080 feet above O.D. 
(9) At the corner of Morton Bank Lane, near High Wood 
Head (West Morton), a small surface of grit is exposed. The 
quartz grains are worn down smooth, and fine striae groove the 
surface from N. 45° W. to S. 45° E. 
(10) Mr. E. E. Gregory has kindly furnished us with details 
of a striated surface observed by him on Farnhill Moor, 200 
yards S.E. of the Jubilee Tower. " The striae show that the 
glacial material, which caused the groovings, has come from 
a point about 30° to the west of north. The whole of the rock 
surface for about a quarter of a mile to the north-east bears 
evidence of a similar condition." The altitude is 725 feet 
above O.D. 
V. — The Distribution of the Drift. 
The following notes on the distribution of the drift commence 
in the north-west and proceed down Airedale, taking first the 
south side and then the north side of the dale. The floor and 
lower slopes of the Glusburn Valley are covered with dark, 
bluish boulder-clay, weathering to a yellow colour and containing 
many striated boulders, a high proportion of which are of lime- 
stone. Behind Malsis Hall about 15 feet of bluish-grey boulder- 
clay, weathering to a yellow colour on the surface, overlies a high 
cliff of shale. The shale for a vertical distance of 12 feet beneath 
the boulder-clay is crumpled up and its bedding destroyed. 
Probably in this instance its position on the rim of a deep valley 
towards which the ice was moving has facilitated the shearing 
of the shale. 
Good sections of the boulder-clay full of limestone boulders 
are exposed in the beck near Ickornshaw. It is often 100 feet 
in thickness without its base being exposed. The boulder-clay 
is continuous across the low part of the watershed with that on 
the western side of the Pennine axis.* Proceeding southwards. 
* Geology of the Burnley Coalfield (Survey Memoir), p. 137, 1875. 
