JOWETT AND MUFF : GLACIATION OF BRADFORD, ETC. 205 
shows current-bedded sand and gravel overlaid by coarse boulder 
gravel. The boulders are usually less than a foot long, though 
a few are nearly three feet in length. The coarse gravel cases 
in the sand and fine gravel, so that the section appears to be 
" arch-bedded." The stones in the gravel are water- worn and 
fairly well rounded. They consist of grit, sandstone, gannister, 
and limestone, with pieces of shale and ironstone nodules. 
Lateral moraines trending from N.W. to S.E., or from W. 
to E. occur at several places on the hills on both sides of the 
Aire. 
On Hallas Rough Park, about one mile S.S.W. of Culling- 
worth Station, a series of low drift mounds runs in an almost 
west to east direction. A section in a gravel pit near the eastern 
end of the mounds shows strongly current-bedded gravel and 
stratified sand interdigitating with irregular lenticles of bluish 
boulder-clay. At the top of the pit is a grit boulder over 3J feet 
long, striated in the direction of its long axis from N. 40° W. 
to S. 40° E. These mounds lie almost at the upper limit of the 
boulder-clay, and were probably deposited at the edge of the 
ice about the period of its maximum extension. 
A large mound on the east side of Denholme Station consists 
of unstratified gravelly drift. The boulders are mostly sub- 
angular, and are of all sizes up to three feet in length. They 
are chiefly composed of grit and shaley sandstone, mixed with 
bits of shale and sand. The mound on the other side of the 
station appears to consist of finer and more water-worn material 
resting on shale. The mounds seem to mark the limit of the 
drift in the Harden Valley, and are probably morainic in 
origin. 
At Nook, nearly two miles W.N.W. of Oakworth Station, 
a small crescentic mound with its concave side turned towards 
the north-east is cut through by Newsholme Beck. It consists 
of very stony clay and was probably formed at the edge of 
the ice at some stationary period during the general retreat 
of the glacier. The altitude is 1,025 feet above O.D. 
A little north of Cowloughton Dam, one mile south of 
Ickornshaw (Glusburn Valley), and at an altitude of 1,100 feet 
above O.D., unstratified gravelly drift is piled up into a large 
