THE ORIGIN OF DERBYSHIRE SCENERY. 





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interesting and instructive ; and in many places our Derbyshire 

 valleys afford characteristic examples of Hmestone erosion. The 

 minute structure of the rocks and inequalities in hardness give 

 rise to peculiarities in the weathering of such rocks, which are 



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most interesting, but which it is not within the province of this 

 paper to discuss. We must, however, take into account the 

 influence which the divisional planes of the rock possess in 

 inducing the disintegrating agents to work along certain lines. 

 These divisional planes are of two kinds, (a) planes of stratifica- 

 tion, and {d) joints. They can be very easily seen on the face 

 of most cliffs, the planes of stratification giving to the rock 

 a "bedded" character, while the joints appear as more or less 

 vertical cracks. Indeed, the former may be seen in the stones 

 of almost any old building. Old weathered sandstone blocks 

 may be noticed in the walls of St. Peter's Church, Derby, which 



