220 JOWETT AXD MUFF : GLACIATION OF BRADFORD, ETC. 
yellow at the top, and is full of limestone boulders. In some 
places it is cemented into a hard conglomerate. 
Boulder- clay with abundant limestone pebbles is exposed 
in deep sections in Morton Beck, above Sunny dale Mill, and 
appears to extend up to about 1,100 feet above O.D. on the 
moor to the north. In the quarry at the Bingley Sanitary 
Pipe and Tube Works, a mile and a quarter N.N.E. of the town, 
a pre-glacial hollow filled with boulder-clay is seen in section. 
The old valley is about 30 feet deep and 90 feet across at the 
top. The clay filling the valley is yellow at the top but brownish 
below. It contains numerous boulders of grit and sandstone, 
a quantity of shale fragments, and some chert. Several blocks 
of Syringopora, from which the limestone matrix has been 
dissolved, have also been taken from the clay. 
In a large grit quarry at Gilstead, east of Bingley, about 
four feet of yellow boulder-clay with chert pebbles overlie 
five feet of stratified silt and gravel which rests on the Millstone 
Grit. The gravel, which is seen on the western side of the 
quarry, thins out towards the east. 
The most important facts in connection with the distri- 
bution of the drift in the Hawkswortli and Guiseley districts, 
have been mentioned already (p. 207). 
East of the Guiseley Valley the drift is generally thin, and 
occurs only in outlying patches. At the east end of Apperley 
Bridge Station gravel was seen banked against an irregularly 
sloping surface of shale. The gravel passed eastwards into 
fine sand, and was overlaid by boulder-clay containing lime- 
stone. 
In the Horsforth Valley yellow boulder-clay with rounded 
pebbles of grit and sandstone occurs near Scotland, and at 
the south end of the Bramhope Tunnel. 
At the junction of the Horsforth and Otley Roads, in 
Headingley, boulder-clay eight feet deep was exposed in ex- 
cavating for foundations. The clay contained striated boulders 
of grit and gannister. Stony clay, in which two pebbles, 
of chert were found, is exposed in Rowley's Quarry, Meanwood. 
East of Leeds boulder-clay is known to occur on Whin Moor 
and in a quarry at Scholes, as mentioned above. 
