46 RIVERS. 



Whin), and becomes the boundary between Yorkshire and Dur- 

 ham. This great waterfall is ' Caldron Snout/ a wild and dreary 

 cataract, seldom visited, though accessible from the High Force 

 Inn. Good pedestrians may from this point explore High Cup 

 Nick, and the other deep cuts in the summit of drainage, from 

 which the views toward the Lake mountains over the deep Vale 

 of Eden are magnificent. 



Maize Beck, which for a short space separates Yorkshire and 

 Westmoreland, is the most interesting branch of the Tees for a 

 geologist to follow. For about two miles above Caldron Snout, 

 Maize Beck runs on the greenstone ; then limestone rock (called 

 Tyne bottom limestone) appears over the greenstone and con- 

 tinues without interruption to the western front of Dufton Fell 

 (in Westmoreland), where the greenstone appears again below 

 this limestone, but reduced in thickness to 24 feet. 



Proceeding down the Tees from Caldron Snout, we find the 

 greenstone continue in bold cliffs with limestone over it; the 

 limestone being in some places bleached, and recrystallized where 

 in contact with the trap, so as to resemble coarse statuary mar- 

 ble. Cronkley Scar gives examples of this. The Tees spreads 

 widely in a shallow channel full of stones*, till we approach the 

 High Force, a waterfall of 69 feet, over greenstone resting on 

 shale and limestone, the shale prism atized by the heat of the 

 trap, but the limestone not bleached as that above the trap is. 

 The High Force shows usually one great stream of water, but in 

 times of great flood a second channel through the rocks is filled 

 with another current. This is a very grand scene. The dark 

 tints of the rocks, the agitation of the water, the contraction of 

 the channel, and the ornament of wood, make a very effective 

 combination. A much improved Inn near the Fall will be found 

 very convenient for exploring Upper Teesdale, and ascending 

 Mickle Fell. 



* It is common to ride through the Tees here. Late one evening, after 

 a long day's walk, I attempted twice, and each time in vain, to save a few 

 miles of walking in the dark, by wading through the stream when it was in 

 flood, a foolish experiment. 



