178 
HUGHES : INGLEBOROUGH. 
of the conditions under which the Carboniferous rocks were 
laid down. 
Playfair, in his " Illustrations of the Huttonian Theory," 
1802, pp. 217-219, says, " I shall mention only one other [instance 
where the secondary strata are seen lying horizontally on the 
primary] which was discovered by Lord Webb Seymour and 
myself at the foot of the high mountain of Ingleborough, in 
Yorkshire. As we went along the Askrigg road from Ingleton, 
about a mile and a half from the latter, an opening appeared 
in the side of the hill, on the right about 100 yards from the 
road, formed hy a large stone, which lay horizontally and was 
supported by two others standing upright. On going up to 
the spot we found it was the mouth of a small cave, the stone 
lying horizontally being part of a limestone bed, and the two 
upright stones vertical plates of a primary argillaceous schistus. 
The limestone bed which form^ed the roof of the cave was nearly 
horizontal, declining to the south-east ; the schistus nearly 
vertical, stretching from north-west by we-st to south-east by 
east. The schistus, though close in contact with the limestone, 
seemed to contain nothing calcareous and did not effervesce 
with acids in the sligjhtest degree." 
This description, written more than 100 years ago, evidently 
refers to a small cave near Dale Barn, on the south-east side of 
Chapel -le-dale, north of which the following section is seen 
(Fig. 1), which explains how it happens that the stream running 
a. Grey Limestone. 
c. Limestone full of fragments of 
the immediately underlying 
rock, i.e., Green Slate Series. 
h. Grey Limestone with quartz 
pebbles and a few chip? from 
the Green Slate Scries. 
d. Alternations of slate and thin 
sandstones to 2 inches each 
in thickness. 
Fig. L 
SECTIO>' SEEN NORTH OF DALE BARN, CIIAPEL-LE-DALE. 
Scale, about 8 feet to 1 inch. 
