190 Mr. Hutton on the Stratiform Basalt. 



ting rock near to the liver ; the wild scenery there exhibited, owing its 

 peculiar character to the rugged outline, the great extent, and thick- 

 ness of this bed. At High Force and Cauldron Snout, two beautiful 

 waterfalls, the river cuts through it, and displays the beds upon which 

 it reposes. About half a mile below Cauldron Snout, on the north bank 

 of the river, the violent action of heat upon the beds below the 

 Basalt is very evident ; the various phenomena here displayed, as well 

 as those connected with the Basalt in Teesdale, generally, are described 

 by Professor Sedgwick, with his well known ability, in the paper before 

 named, and which we shall have occasion to refer to hereafter. He has 

 described several curious instances of the mechanical effects of the Ba- 

 salt upon the beds below it ; an example of this kind is to be met with 

 by the side of the new foot-path leading to the Pool, beneath the High 

 Force, which has been exposed since he described the district, and may 

 be easily observed by any one visiting the waterfall. 



No. 1 Junction of LIMESTONE and BASALT, near High Force, in Teesdale. 



I'-' 



vBt&SAIil^ 



LIMESTOHE 



The Limestone under the Whin is much altered, having become white 

 and crystalline. 



In the Tees, above Cauldron Snout, the Whin Sill may be seen about 

 300 yards above the Weal (an extensive and deep pool formed by the 

 damming back of the river). The bed above it here is a Limestone of 

 considerable thickness, rendered generally of a coarse granular texture, 

 and of a white colour. In ascending the stream the Basalt is covered 

 by the superior strata, but at a lead mine called Nether Hurth, the 

 Whin was worked into in following a vein, and found to bear a good 

 deal of ore. In the mine at Troutbeck Foot, on Tees side, four miles 



