330 
HUGHES : INGLEBOROUGH. 
BALA BEDS. 
In ascending section above the Green Slate Series and in 
descending section below the Silurian flags, grits, and conglomerates, 
we always find masses of roughly-cleaved shales with calcareous 
bands and concretions and beds of limestone. Notwithstanding 
the folded and faulted condition of the older rocks in this area 
the true sequence can generally be established in these beds, 
and the newer are found to occur next in succession below the 
Silurian, and the older next in succession above the green slates, 
though some members are here and there missing, being probably 
dropped out by faults. Some bands are highly fossiliferous, and 
the fossils as well as the position of the series makes it quite 
clear that this is the equivalent of the Coniston Limestone and 
Shale of the Lake District and the Bala Limestone and Shale 
of North Wales. The details, however, vary across this limited 
area, and, as might be expected, the exact correlation of sub- 
divisions with those of more distant regions is at present very 
incomplete. 
They are seen in the bed of the stream striking parallel to 
the great fault which traverses the gorge of the Twis or Greet 
below Thornton Force, as described above.* 
The part of the series here exposed consists of a shale with 
layers of lenticular concretions of limestone. The lower beds are 
concealed by masses of drift and torrent debris — and that which 
is seen is so much crushed that all traces of fossils have been 
mostly obliterated, while the few that are found are generally so 
obscure to be almost unrecognisable. 
However, there are fossils in it, and when the zones of the 
Bala Beds of this district come to be worked out in detail there 
may be enough paljeontological evidence here to determine the 
exact horizon. 
Sedgwick records the following fossils as having been found here 
near the upper dyke : — Stenopora (Favosites) fibrosa Gold., Ualy sites 
* Proc. Yorks. Geol. and Polytec. Soc, Vol. XIV., pp. 146, 147. See 
Section Fig. 6. 
