﻿40 



MR. T. F. SIBLT ON THE FAUXAL SUCCESSION IN TBE [Pob. IpoS, 





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railway. In a cutting 

 400 yards from the 

 tunnel the cherty beds 

 are horizontal, but 

 about 200 yards far- 

 ther westward they 

 suddenly rear up, with 

 an easterly dip of about 

 30°, and abut against 

 a mass of toadstone. 

 According to the Geo- 

 logical-Survey Memoir 

 (p. 19), the cherty 

 beds here rest in un- 

 disturbed sequence on 

 the toadstone (which 

 is the upper lava-flow 

 of the section), the 

 absence of the latter 

 at Litton Tunnel and 

 elsewhere being attri- 

 buted to a very rapid 

 thinning-out of the 

 lava-flow. The junc- 

 tion is, however, ob- 

 viously a faulted one. 

 Moreover, the toad- 

 stone can be followed 

 westwards along the 

 railway, and in a large 

 quarry (Miller's-Dale 

 Lime-Works), south of 

 the line, massive white 

 limestones, with a 

 thickness of about 120 

 feet, are found to over- 

 lie it. These massive 

 white limestones are 

 themselves succeeded 

 by thinly-bedded cherty 

 limestones. 



My conclusions are, 

 therefore, as follows : — 

 The upper toadstone 

 is, in normal sequence, 

 separated from the 

 cherty-limcstone series 

 by about 120 feet of 

 massive white lime- 

 stones. A fault, with 



