22 



PKOF. T. M*KENinr HITGHBS ON THE POSITIOK 



The absence of any passage from one to the other. 



The identification of both series with others known to be discor- 

 dant to one another. 



The analogy of similar foldings-in of newer rocks so as to pro- 

 duce on the surface the effect of a true sequence. 



In illustration of my remarks, I subjoin a section across the valley 



Diagram Section across the Valley at Ohermittweida, 

 (Length of Section 200 yards.)) 



w. 



a. Crushed rock. 



c. Micaceous flagffy rock. 



F. Fault. 



h. Micaceous Sandstone. 

 d. Mica-gneiss. 



at Obermittweida. I did not observe any such repetition of similar 

 beds as would justify the assumption thas we saw the whole of the 

 infolded conglomeratic series. I should expect to find that the 

 conglomerates might be repeated somewhere in the bottom of the 

 valley, but that in the line of this section they were cut out by a 

 fault. The crushed rock {a) between the two gritty bands seen near 

 the bottom of the section may perhaps be the centre of the fold. 



The micaceous sandstone (6) between the two bands of con- 

 glomerate is exactly like some of the beds in the conglomerate at 

 the base of the Cambrian of Bangor. 



The micaceous flaggy rock (c) above the conglomerate seen highest 

 up the hill is quite unlike the mica-gneiss {d) seen in the wood 

 above or on the east side of the valley below. It is more like what 

 might be called a mica-arkose. If 'this be included in the con- 

 glomeratic series there is no junction seen between that series 

 and the gneissic series. 



An examination of the section showed me that there was no 

 passage from the one to the other, and that there was room for such 

 folds and faults as would most easily explain the occurrence of the 

 conglomeratic series, if for other reasons it could not be included 

 among the gneisses. 



