64 The Rev. D. Williams on the Geology of Devon ^ Cornwall, 
emergence. A thousand embarrassing facts on the west of 
Dartmoor, and elsewhere, at once were reconciled, and the 
rocks appeared before me, like a cloud of witnesses, to testify 
that the floriferous series was overlaid by the Cornish 
killas, and requiring me, as it were, to restore each to his 
rightful throne. 
My long section exhibited at the Geological Society did 
not perhaps show the south anticlinal axis sufficiently pro- 
minent or distinct, for I see by my maps that the Coddon 
Hill grit, commonly dipping souths occupies nearly two miles 
of country from north to south ; and that at and about Dod- 
discomb Leigh, it is in the same parallel with the great line 
of fracture on the W. of Dartmoor which ranges by Laun- 
ceston to Bos-Castle ; and that this line continued through 
Dartmoor will intersect it at Amicomb Hill, between Fur- 
Tor and Yes-Tor, which Mr. MacLauchlan has determined 
to be the highest points of elevation in the West of England. 
Any omission in my section, however^ I request may be im- 
puted to my deficiency in tact in getting up a section, and 
not to any imperfection in the evidences afforded by the coun- 
try ; but in reply to the objection urged by Mr. Murchison, 
I may state, that the Posidonia limestones being only insulated 
patches in the Coddon Hill grit, and therefore part and parcel 
of the mineralogical axis, are quite as likely, in the southern 
fall, to dip away from the trough, as to dip into it; my sec- 
tion, however, gives the floriferous rocks as the most promi- 
nent of the anticlinal, which I still think is very near the 
truth, and may be explained by supposing them to arch over 
the subordinate Coddon Hill grits ; or still better by the fact, 
that in the N. of Devon the Coddon grits are divided into an 
u}iper and lower, by great wedge-shaped masses of the flori- 
ferous rising into prominent hills, viz. south of Barnstaple, 
and north of Bampton, so that the lower range of these grits 
may not be exposed here at all. 
All I have to say further is, that since the day I picked up 
the master-key at Chudleigh and Doddiscomb Leigh, I have 
not met with the least difficulty or embarrassment; nor do I 
anticipate anything hereafter but additional confirmation, from 
the conviction that nature will not be, as she has not been, 
permitted to deny herself ; and I again earnestly invite Prof. 
Sedgwick and Mr. Murchison, or Mr. Weaver, to review the 
county ; for after all, there are no gentlemen to whom 1 would 
sooner refer this question than to themselves. 
I have the honour to remain. Gentlemen, &c. 
nicadon, near Cross, Dec. IGth, 1839. D. WILLIAMS. 
