SON PLATEAU. 207 



/' Thill -bedded limestone with intereahitions of bhick eoaly Ft. 



_ ) shale; contains many carboniferous fossils. It changes 



Cahbontt^p'rott^ */ 



into compact limestone, on the upper surface cavernous and 



corroded ... ... ... ... ... 200 



I 



The carboniferous rocks are faulted here, and seen in the stream bed at 

 the foot of the cliff. 



Furtlier down the glen on its right-hand side, a stream course enters 

 from the west showing a little of the red salt-marl 



Eight side of glen. 



and some slipping and crushing of the overlying 

 rocks. The purple sandstones here appeared to contain, at the top of the 

 group, a 50-feet bed of coarse conglomerate, the pebbles being all of old 

 crystalline or metamorphic rocks. The dark, shaly silurian band is 

 much obliquely laminated, contains fine black and white ribband layers 

 of sandy shale with hsematitic nodules and some sandstone bands, the 

 whole group having a greenish aspect. Thick and thin bedded speckled 

 sandstones succeed, and are overlaid, first by the carboniferous and then 

 by the nummulitic group stretching along the glen side up towards 

 Nursingphoar. On this side of the glen, just after passing the gap 

 through which the river crosses the " purple sandstone,'^ Dr. Waagen found 

 greenish thin -bedded soft sandstones, partly coaly, with a thick band of 

 conglomerate of crystalline pebbles, the group being about 50 feet in 

 thickness, and most probably the same as that just now noticed. Above 

 this succeeded a great mass of thin-bedded reddish sandstones and 

 red shales, over which came about 100 feet of lavender clay, with 

 sandstone and marlstone layers. In its upper part this lavender clay 

 became coaly and black, and was overlaid by yellow and grey sandstones 

 with £ellerop/ion, produdus, &c., of the carboniferous group. The laven- 

 der clays, hitherto very thick at the top of the " speckled and reddish 

 sandstone " series, here begin to grow thinner, but they are often subject 

 to local variation in this respect. 



Further up the stream than Nursingphoar, and just where it bends 



Above Nursingphoar. 



from west to south-east, the fault is seen bringing 



the nummulitic and carboniferous beds discordantly 



( 207 ) 



