JOWETT AND MUFF : GLACIATION OF BRADFORD, ETC. 235 
small feature, near Brow Top, just south of the intake of the 
Sugden End gap. The levels of the Worth Lake at these very 
temporary periods would be about 905 and 850 feet respectively. 
A small lateral intake also enters the Sugden End channel on 
its north side at 730 feet. 
The ridge between the Worth and Harden Valleys to the 
north of the Sugden End gap remains considerably higher than 
that gap, until it drops suddenly towards the main valley near 
Keighley. As might be expected the ridge is not cut through 
by any overflow channels. The Sugden End gap would carry 
off the waters of the Worth Lake, whilst the ice was retreating 
down to the main valley. It was thus probably in operation 
for a comparatively long period. Remains of a possible beach 
belonging to this stage are indicated by the terrace, which runs 
along the hillside from the Sugden End gap southwards towards 
Oxenhope. Its altitude is 720 feet — that of the intake of the 
Sugden End Valley. 
The terrace and shallow channel on the slope of the ridge 
iacing the main valley of the Aire and east of Long Lee, near 
Keighley, may perhaps be due to the escape of the Worth Lake 
overflow between the edge of the glacier and the hillside. Its 
altitude is about 720 feet above O.D., and it probably marks 
an oscillation of the ice-front shortly before the Sugden End 
gap was deserted. 
The Outlets of the Worth Lake. — The first stage of the retreat, 
when the discharge of the Worth Lake took place by the gap 
(Wether HiU Clough) below Harbour Hole at 1,120 feet, has 
already been mentioned (p. 227). A sloping terrace of sandy 
•drift, with large angular and rounded blocks of grit and a pebble 
or two of chert, occurs near the lower end of this channel, where 
the stream would enter the Oxenhope Lake. The altitude is 
960 feet. This corresponds to the altitude of the overflow at 
Cuckoo Park, whence the Oxenhope Lake discharged during the 
first stage of the retreat of the ice. 
A further shrinkage of the ice lowered the waters of the 
Worth Lake to the shallow gap, marked " Stanbury Height " on 
the six-inch map. This gap lies on Haworth Moor one mile 
south-west of the church. Its intake-level is just under 975 feet. 
