124« Mr. Hopkins's Remarks on Farey's Account of the 



sides of it to the height (where the upper surface of the bed is 

 most elevated,) of perhaps 200 feet. It has manifestly been 

 raised to this position by an E. and W. fault which ranges 

 nearly parallel to the valley of the Wye, and is here about 

 300 or 400 yards from it. The toadstone is here seen, from 

 the bottom of the dale to the height just mentioned, to abut 

 directly against the limestone, which forms, as it were, a 

 solid wall intervening between the toadstone and the valley of 

 the Wye, thus concealing the raised edge of the toadstone as 

 we proceed westerly along the latter valley till we come to 

 Litton Mill, where the intervening wall becomes too low for 

 that purpose, and accordingly the toadstone then reappears, 

 its upper surface being high in the side of the valley, at an 

 elevation exactly corresponding to its position in Crossbrook 

 Dale. From this place it is easily traced to the southern ex- 

 tremity of Tideswell Dale, the point at which Farey asserted 

 the toadstone to belong to his second bed ; whereas the facts 

 I have now stated establish the identity of the beds at Tides- 

 well Dale and Crossbrook Dale as clearly as I have esta- 

 blished a similar identity at Litton and Tideswell, as above 

 mentioned. 



It must be carefully observed here, that the partial toad- 

 stone basset I have just described nowhere descends down 

 the side of Monsal Dale or Miller's Dale to the level of the 

 river, as it must necessarily have done had there been a con- 

 tinuous complete basset crossing the river at the mouth of 

 Crossbrook Dale, as Farey describes ; and in like manner on 

 the south of the river the toadstone ranges at a considerable 

 elevation along the side of the valley, as on the opposite side, 

 but nowhere, as far as I have been able to ascertain, does it 

 descend continuously to the margin of the river. I conceive 

 this toadstone to have been elevated by a fault exactly similar 

 to that on the N. side of the river, and exactly parallel to it. 

 According to this view of the subject the valley of the Wye, 

 from Chee Tor to the point near Longstone, must have been 

 originally formed by two parallel faults, 400 or 500 yards 

 as under, the strata being elevated on the N. side of the more 

 northern, and on the S. side of the more southern fault, 

 leaving the intermediate portion in nearly its original position. 

 In this intermediate portion the lower part of the present 

 valley has been formed, as I conceive, by erosion. The small 

 inclination of the lines of stratification, and their almost un- 

 broken continuity in the precipitous rocks which rise imme- 

 diately from the margin of the river between Crossbrook Dale 

 and the upper end of Miller's Dale, attest the slight disturb- 

 ance which the portion of the limestone beds between the 



