JOWETT AND MUFF : GLACIATION OF BRADFORD, ETC. 217 
sandstone. It was weathered yellow to a depth of three feet 
from the top. The clay contained striated boulders of white 
and dark blue Carboniferous Limestone ranging up to 18 inches 
in length, boulders of Millstone Grit up to five feet in length, 
blocks of Coal Measure sandstone, and a good deal of broken-up 
shale. The sandstone boulders were sometimes rounded and 
striated, sometimes angular and not scratched. Between Canal 
Road and the railway north of Frizinghall Station several ex- 
posures showed yellow clay passing down into blue clay. Lime- 
stone pebbles were found in both. Amongst the boulders 
thrown out of one of these cuttings the Lake District andesite 
mentioned on page 200 was found. 
Near the head of Red Beck where a lane crosses it, there is 
about 50 feet of boulder-clay with boulders of Millstone Grit 
four feet long. Near Heaton Royd and Heaton Stray yellow 
clay was seen passing down into blue clay with stones. 
The general distribution of the boulder-clay around Bradford 
has been described by Tate,* and more recent exposures have 
been described by Dr. Monckman.f Blue boulder-clay with 
limestone is found up the Thornton Beck as far as Leventhorpe, 
where it is overlaid by laminated clay and gravel (see p. 225). 
It also occurs in stream-sections below Clayton on the south 
side of the valley, but not above the 700-foot contour. Higher 
up the valley towards Thornton no till has been found, the only 
superficial deposit being a yellow rainwash, sometimes with 
a few angular local stones. It is sandy or clayey according to 
the nature of the rock on which it lies, or which occurs a little 
higher up the slope. Quite in the bottom of the valley, however, 
there are a few blocks of Millstone Grit, an explanation of the 
occurrence of which will be given later (p. 226). Eastwards from 
Clayton boulder-clay, with limestone and chert boulders, is 
found at Great Horton (near Close Top Farm at 700 feet above 
O.D.), Little Horton, and Bowling. South of Bowling the Aire 
and Calder divide, which to the west is over 800 feet above O.D., 
* T. Tate. " The Glacial Deposits of the Bradford Basin." Proc. 
Yorks. Geol. and Polyt. Soc, vol. vi., p. 101. 
t J. Monekman, D.Sc. Brit. Assoc. Report (Bradford), 1900, p. 754, 
and Proc, Yorks. Geol. and Polyt. Soc, vol. xiv., p. 851, 1901. 
