234 JOWETT AND MUFF I GLACIATION OF BRADFORD, ETC. 
cut through. Gravel, exposed for ten feet in an old pit, overlies 
the grit on the south side of the dry valley at an elevation of 
840 feet. Towards its lower end the channel narrows and then 
opens out into a normal valley at 725 feet. Here are several 
small moundy features in which an obscure section showed 
about three feet of yellow loamy sand and stones. 
On further shrinkage of the ice the great gap was opened at 
Sugden End, directly east of Haworth. The original height of 
this col was probably about 800 feet. At present it is 720 
feet. The Sugden End overflow-channel consists of three chief 
portions. The first, in which a small reservoir lies, is a broad 
flat-floored channel with a very steep and fresh scarp on the 
south side about 150 feet high. On the north side it is con- 
tained by a low bank of rubbly grit with boulder-clay banked 
against its outer face. This portion of the channel leads into 
the short but deep gap which cuts through the watershed. It 
is a conspicuous opening through the hills to be seen for miles 
to the east or west of it. As already mentioned it has been cut 
down from about the 800-foot contour, the original dip in the 
watershed being largely due to the fault which crosses it here. 
The channel continues in an easterly direction, but near Sugden 
House it turns slightly to the south, forming a valley with 
a broad floor and very steep sides excavated in the flank of the 
hill on the south side of Eller Carr Beck. At its lower end it 
turns to the north-east and terminates at the 650-foot contour. 
The Harden Lake, into which the stream poured, was at this 
period discharging by the gap at Coplowe Hall (p. 231). The 
characters of the Sugden End channel, which strongly scarps its 
southern bank at its intake and forms an " in-and-out " channel 
near its termination, indicate that the ice stood close up to it, 
at least during its initiation. 
Stages in the discharge of the Worth Lake* intermediate 
between the Flappit Spring and Sugden End overflow-channels 
are indicated by the scarp and shallow channel on Brow Moor, 
to the east of the head of the Flappit Spring Valley, and by the 
* It will be shown below that before this period the Oxenhope and 
Worth Lakes coalesced to form a single lake, which it is convenient to 
speak of as the Worth Lake. 
