ANNALS 



OF 



PHILOSOPHY 



SEPTEMBER, 1821. 



Article I. 



On the Geology of the Neighbourhood of Okehampton, Devon. 

 By the Rev. J. J. Conybeare. 



(To the Editor of the Annals of Philosophy.) 



DEAR SIR, 



The western branch of the river Okement has, from the 

 general beauty of its scenery, and the singularly picturesque site 

 of the castle, which guards the entrance of the defile through 

 which it flows, long ago attracted the notice of tourists. Its 

 course, like that of most mountain streams, affords also to the 

 geologist a tolerably perfect section of the rocks superposed 

 upon that from which it takes its rise (in this case, the central 

 granite of Dartmoor). His researches will be facilitated by the 

 magnificent road lately cut on its NW bank by Mr. A. Saville, 

 and by the extensive limeworks carried on at Meldon Quarries. 

 I have to regret that my own inspection was too cursory, and my 

 collection of specimens too limited, to afford materials for a fuller 

 and more accurate description; but as none has, I believe, 

 hitherto been made public, the following memoranda may not, 

 perhaps, be altogether uninteresting. 



Believe me, with much esteem, dear Sir, 

 Very truly yours, 



J. J. Conybeare. 



The granite through which the Okement first flows as a moun- 

 tain torrent presents the same general character with that of the 

 New Series, vol. 11. m 



