DEPOSITED IN WATER. 
49 
\ 
Feet. 
20. Blue crinoidal limestone. 
35. Shale. 
15. Limestone, light coloured, 
r Gritstone, thin, 
i Shale. 
50. 
90. 
1G0. 
{ Calcareous layers with shells and turbinolia. 
Thick shales. 
Two or three beds of blue limestone in shale, 
f Strong angular sandstone. 
I I Limestone. 
Limestones, Sec. 
Limestone under fossiliferous plates. 
Northern districts of the Yoredale Series . — We may now proceed 
to trace the character of the Yoredale series in the country farther 
north. Swaledale, which runs from west to east parallel to Wensley- 
dale, Arkendale which runs in a south-east direction and enters the 
left bank of the Swale, the vale of the Greta, Lunedale, and Tees- 
dale, with the escarpments of the Penine chain, will afford us suffi- 
cient data for this research. It must, however, be observed, that not 
one of the valleys named, nor any other lying to the north of Wen- 
sleydale, shews so completely as that the lower scar limestones which 
are the general base of the system. 
Swaledale . — This great valley is remarkable for commencing at a 
very high mountain pass, in beds above the whole of the Yoredale 
limestones; it then excavates its passage through the main, underset, 
middle, Simonside, and Hardrow limestones, and again crosses these 
rocks as they necessarily sink eastward faster than the stream. The lower 
limestones are best seen about Muker, the upper belt is every where 
conspicuous. In a general sense, and as compared with Yoredale, 
Swaledale may be said to be in a depression of the strata. It is full 
of dislocations. Five lines of section have been attended to in connecting 
the Yoredale and Swaledale series ; the first is from Hawes to Muker, 
over Stag fell, and down Cliff gill ; the second from Askrigg to Muker ; 
H 
