433 
NOTES 0\ THE CAVES OF YORKSHIRE. PART II. BY S. W. CUTTRISS. 
{Eead Novemher 17 th, 1898.) 
Plates LXIII.-LXV. 
In m}' previous communication on this subject, which appears 
in the Proceedings of your Society for last year, it was found 
convenient to divide the area under consideration into three 
Sections : 1st, the Yoredales, including the rocks of that 
formation ; 2nd, the Southern Carbonifenjus or Craven Section, 
inckiding the Carboniferous Limestone lying between the Upper 
and Middle Craven Faults : 3rd, the Main Carboniferous Section, 
comprising the remainder of the Carboniferous Limestone outcrop 
included within the imaginary boundary therein defined. (Proc. 
Yorks. Geol. and Polytec. Soc, vol. xiii, j^. 313.) 
As a field for studying the action of water on limestone, 
and the effect of the resulting underground watercourses on the 
general drainage of the district, the third Section is by far the 
most interesting, and it is to this Section the pre-ent notes 
refer. The district includes the whole of the Carboniferous 
Limestone contained within a boundary roughly determined by 
the Leek Fells, Kingsdale, Chapel-le-dale, and Ribblesdale, its 
southern extension being limited by the North Craven Fault. 
The Memoir of the Geological Survey of the District refers to 
this limestone as follows: — "The Great Scar Limestone attains 
its highest point above the sea (about 1,500 feet) on the S.W. 
side of Ingleborough, near Newby Moss ; it falls to about 
1,200 feet at Southerscales Fell and South House Moor in 
a distance of nearly three miles, which equals a fall of 100 feet 
per mile, or 1 in 53 nearly, not much more than a dip of 1" 
on the average, but in places of course the dip becomes steeper. 
The ba>e of the Carboniferous Series lies at an elevation of 
725 feet at God's Bridge and Thornton Force, nor in Chapel-le- 
dale does it anywhere rise more than 150 feet above this, })ut in 
