27 
mond it is joined by another branch from Barningham and Dalton. Below 
Catterick it winds through a more level country, in a south eastern direc- 
tion. At Deeming it is further augmented by Grim scar Beck, which rises 
amongst the group of summits a few miles south of Beeth, and flows past 
Bellerby and Bedale. After its junction with the Wiske, near Sandhutton, 
the Swale forms the boundary between the eastern and western sub-pro- 
vinces. The district which it drains on the west becomes much narrower, 
and does not contain any town of importance. Opposite the mouth of 
Codbeck is Leckby Carr, the original British station for Scheiwhzeria 
palustris. At My ton the Swale unites with the Ure. 
Surface. — A considerable portion of the watershed of the Swale is 
included within the arctic region. Between Arkendale and Swaledale, the 
summits of Rogan’s Seat, Watercrag and Pinseat attain respectively an 
elevation of 2207, 2192, and 2125 feet. Round the head of Swaledale 
several peaks exceed 2000 feet. Of these, the loftiest is Hugh Seat (2330 
feet). Along the summit of drainage between the Swale and the Yore, rise 
the peaks of Shunnor Fell (2351 feet), the second in altitude of the moun- 
tains of north Yorkshire, Lovely Seat (2216 feet), and Bakestone Edge 
(1983 feet), The remaining portion of the more considerable moorlands, 
including the upper part of Arkengarthdale and the valley of the Swale 
above Muker, are comprised in the middle zone. The whole of the eastern 
part of the district, from Richmond racecourse, on the north side of the 
river, and Downholme moor, on the south, with the lower levels of the 
dales, is included in the lower zone. 
Structure. — The principal summits at the head of Swaledale, and the 
lower levels of the vallies of the Swale and Arkle, are formed from lime- 
stones of the Yoredale series. The surface of the more elevated portions 
of the moorlands sloping gradually towards the east, consists of millstone 
grit. New red sandstone strata, overlaid with diluvial clays, fill up the 
eastern part of the district. At Topclifle the river touches the lias forma- 
tion. 
No. VII.— URE. 
Drainage. — Wensleydale is formed by the junction of two branches, 
Widdale and Cotterdale, which unite below the town of Hawes. The 
river is supplied by numerous small streamlets, which rise amongst the 
