Geology of High Teesdale. 155 
My last visit to Teesdale did not enable me to make out the 
true relations of this mass of trap; but I think there is no doubt 
of its immediate connexion with the dyke, which, after crossing 
the road, ranges about E. by N. and is seen again in the western 
branch of the rivulet which runs down to Eglestone. 
In the course of last summer I also traced the second trap-dyke 
from the bed of the same rivulet (where it first appears about a 
quarter of a mile above the preceding) to the top of the ridge of 
hills which extend on the north side of the smelting-house: and 
I was enabled to ascertain that its mean bearing is very nearly 
magnetic E. and W. The two dykes do not, therefore, probably 
unite or imtersect each other in their course through the eastern 
moors as I erroneously stated in my former paper, (supra, p. 25.) ; 
but on the contrary, appear to diverge from each other in that 
direction. With respect to the probable connexion of these two 
dykes with the Cockfield-fell and Quarringdon Hill dykes, I have 
nothing to add to what is already before the Society (supra, 
p. 40). 
(2.) It will be proper in the next place to notice the trap which ae CE Saddles 
is associated with the shattered and dislocated strata on the west 
side of Lunedale. The first appearance of this kind occurs about 
a mile above Lonton, where the trap rests upon a highly inclined 
bed of indurated slate clay. Two or three similar and probably 
eonnected masses, may be traced on the north side of the road 
towards a conical hill called Saddle-bow. The upper part of this 
hill is composed of a great protruding mass of trap which appears 
to be the centre of the confusion which marks the neighbouring 
parts of the valley. From the cone of Saddle-bow to the ridge of 
hills on the side of Greengate farm, there are at least three places 
where the trap again appears at the surface; but of its true rela- 
tion to the other strata, it is hardly possible to form any correct 
estimate. 
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