DEPOSITED IN WATER. 
65 
on both sides, the middle grit is seen only in patches (on Little Whern- 
side, Great Haugh, Fell crags, &c.) and appears to correspond in position 
with the top grit of P en hill. 
By the mean of two measures in different directions the summit 
of Pen hill is about five hundred and fifty feet above the main or 
twelve fathom limestone. Thus, 
Felt. 
Grit rocks of the summit ... ... 150 
Alternations of plates and flaggy grits, ) 
with Coal in the upper part i 
Plates, flagstones or slate sills, &c. ... 60 
‘ Little’ limestone, chert, and plates ... 80 
Main limestone. 
From Pen hill we look eastward to the Scrafton and Witton coal 
tracts, and northward to the collieries of Leyburn plain, where coal, 
twelve to eighteen inches thick, of good quality is obtained about one 
hundred and twenty feet above the main limestone, and consequently 
nearer that rock than the coal of Scrafton and Pen hill. Under it is 
the whole or greater part of the chert series of Swaledale, and above 
(on the east) comes a millstone grit. 
The same coal is worked about Downholme and Hudswell, also 
above the chert series, and below a thick millstone grit. 
We may now turn to Arkendale, where extensive mines and con- 
siderable coalworks have laid open the stratification. The section of 
Old Moulds is given from a manuscript furnished to the Yorkshire 
Philosophical Society, another which almost exactly expresses the series 
of the Auld Gang mine in Swaledale, is taken from Mr. Westgarth 
Forster, and a third for Arkendale from Mr. Winch. ( Geol. Trans. 
Vol. IV.) 
