192 
HUGHES : INGLEBOROUGH. 
between the Carboniferous and Silurian can be well studied. 
I reproduce an admirable photograph of one of these by my 
friend Mr. W. H. Banks, of Ridgebourne, Kington (Plate XXV). 
In it we observe also the unweathered character of the top of the 
flags and the soundness of the base of the limestone, which often 
stands unbroken, though undercut by the quarrying away of 
the flags for long distances. 
About a mile further north we come to GiUet Beck, and if 
we trace this up to where it issues from the base of the Mountain 
Limestone at Gillet Brae, we shall find as usual that a small 
pre-Carboniferous trough has determined the collection of the 
subterranean water and its point of discharge on the outcrop. 
This section is particularly interesting from the alternations of 
limestone and conglomerate seen in it, and the opportunity it 
affords of collecting fossils very low down in the base of the 
Carboniferous. It is as follows : — 
Fig. 5. 
a. Thin heckled limesstone, mottled with alter- 
nations of a darker or lighter grey; 
passing down into 
b. Nodular earthy limestone. 3 to 4 feet. 
c. Light grey calcareous shale. 2 feet. 
d. Calcareous conglomerate and breccia. 1 ft. 
e. Grey shale. 3 feet. 
Conglomerate and breccia. 1 foot. 
Pebbles and subangular fragments of 
quartz are common, especially in the 
limestone, and generally increase in 
number and size towards the base, where 
there are some as large as a hen's egg. 
Pieces of Silurian flags and sandstones 
also occur in bands. These beds pass 
down by alternations into 
ij. A red conglomerate, chiefly composed of 
partly worn fragments of the underlying 
sandy slate. At the base the fragments 
do not appear to be rolled or worn at all, 
but to have l)een broken off the weatherecl 
edges of the beds on which they rest. 
h. Sandy slate or flag, soft and rotten, deeply 
stained purple, with the top crushed over 
and broken up so that it is not always 
easy to tell where the rock crushed in 
situ ends and the overlying conglomerate 
begins. This supports the view that 
normally the top of the rock under the 
Carboniferous Basement Bed is sound 
and solid, and only where acted upon by 
the waters at the base, collected in the 
troughs and channels in the base of the 
Mountain Limestone, is it decomposed. 
SECTION SEEN" AT GILLET BRAE, NEAR HORTON-IN-RIBBLESDALE. 
