HUGHES : INGLEBOROUGH. 
327 
When two consecutive formations of different character occur 
in a district which has been subjected to great and violent earth 
movement they are almost sure to give way along the line of 
contact, and when denudation attacks such a junction there is 
almost always a result which obscures the junction. Plenty of 
examples of this may be found among the overlying rocks in the 
steep precipices of Ingleborough, but we shall find the difficulty 
which arises from such conditions still greater when we are trying 
to make out the line of junction between such ancient deposits 
as the Green Slate Series and the Coniston Limestone and Shale. 
This prepares us to find that junction sections between the 
two are exceedingly rare and obscure. In the gorge below 
Thornton Force the two series are seen in contact close to where 
the great fault leaves the bed of the stream and runs into the 
hill. Here there are thin papery shales presenting a somewhat 
intermediate character between the fine ash beds below and 
the calcareous shales above, but there is always the doubt that 
we may be here dealing not with true beds somewhat crushed, 
but with masses which owe their bed-like character to mechanical 
rearrangement during periods of movement long subsequent to 
their original deposition. 
There is no other junction of the Green Slate Series and the 
Coniston Limestone and Shale Series seen anywhere in the imme- 
diately adjoining area, though the two formations occur very close 
together in several places and in the same relative position. Some 
green slaty rock exposed at the surface in a weathered condition 
near Moughton Sike in the Crummack valley may belong to this 
series, or to passage beds between it and the Coniston Limestone. 
In the northern part of Ribblesdale the green slates are 
exposed in the bed of Douk Gill to the east of the village of 
Horton. They dip at a high angle in a southerly direction, and 
pass up into calcareous slates full of Bala fossils. About 150 yards 
down stream these turn up again in a synclinal fold broken at 
its west end by a fault"^ which cuts off the Bala Beds, bringing 
the green slates again to the surface. 
* See Sedgwick, Quart. Journ. Geol. Soc, Vol. VIII., p. 49. 
