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up the coal measures appear to be of similar date. We have 

 an instance at Paulton of a fault which dates subsequent to 

 the formation of the has, but the great majority of the disturb- 

 ances which we have been considering to-night must have 

 had their origin long before even the earliest of the secondary 

 deposits, for the inequalities produced had been removed by 

 denudation before the new red sandstone began to be 

 deposited. If, then, the upheaval of the Mendips and the 

 formation of the faults were contemporaneous, and if, as has 

 already been stated, a large proportion of the faults range 

 parallel with the Mendips, showing their lines of action to 

 have been the same, it seems not improbable that they are to 

 be ascribed to one common origin. 



Whether or not this be true of the faults of the district 

 generally, it seems to be the only rational way of accounting 

 for the two more remarkable disturbances, viz., the overlap 

 fault of Radstock and the folded strata of the Vobster Valley. 

 In order to throw as much light as possible on this subject 

 I have constructed a section taking in the different points in 

 question. (See Section No. 2, which has been reduced from 

 the original.) It begins with the highly inclined limestone 

 of the Mendips, and taldng a line as nearly as possible at 

 right angles with that range, it includes the folded strata of 

 Vobster and Mells and the overlapped strata of Radstock. Its 

 northern and southern ends are strictly in accordance with 

 fact, so far as that is ascertainable, and I have endeavoured to 

 connect them by the only theory which seems adequately to 

 account for the circumstances. 



Briefly to embody the conclusions to which it leads : — 

 The existence of volcanic matter in the centre of the Mendips 

 discovered by Mr. Moore having explained beyond doubt the 

 origin of that anticlinal, we are led to infer that the upheaval 

 of the Mendips with the steep inclination prevailing on their 

 northern side has produced that extraordinary folding back 



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