John Josias Conybeare, On the Strata near Clovelly, North Devon (1814)
“ The strata inclined in every direction and describing the most capricious and picturesque forms, both curved and angular, open an abundant field of instruction to the geologist, while they present difficulties of which neither the theory of original deposition on an unequal surface, or of subsequent dislocation, appear to promise any plausible solution. ”
John Josias Conybeare, On the Strata near Clovelly, North Devon (1814)
“ Although these singular contortions are not entirely confined to the dunstone and shillat of Devonshire, they yet occur much more constantly in that rock than in the metalliferous schist of Cornwall. In travelling westward we appeared to lose them gradually. At Bosscastle where the rock evidently approaches nearer to the character of killas, (as it is termed by the miner) they still appear pretty frequently: at St. Agnes they are much rarer and less capricious. ”
John Josias Conybeare, On the Strata near Clovelly, North Devon (1814)
“ A considerable part of the tin of Cornwall is obtained from the killas, and the grey ore of cobalt has repeatedly been found in it. All these minerals have usually been considered as characteristic of the earlier rocks, and none of them are, I believe, stated by the writers of our most esteemed mineralogical systems to occur in that to which they assign the name of grauwacke [5] . ”
