IX. Sketch of the Geology of the South-Western Part of Somersetshire, 

 By LEONARD HORNER, Esq. f.r.s. 



MEMBER OF THE GEOLOGICAL SOCIETY. 



[Read March 3, 1815.] 



§1.1 BEG leave to offer to the Society an account of some ob- 

 servations on the mineralogy of that parf of Somersetshire which 

 lies on the Bristol Channel westward of the river Parret. The short- 

 ness of my stay in the country prevented me from conducting my 

 examination with that minuteness of detail which an accurate 

 survey should possess, but I trust that with the assistance of the ac- 

 companying map* and the series of specimens which I have deposited 

 in the museum of the Society, the following notes will be sufficiently 

 distinct to afford a general view of the geological structure of that part 

 of England. I have distinguished in the map, by means of different 

 colours, the situation which the several rocks occupy, and although, 

 from unavoidable sources of error, the boundaries of each can 

 only be considered as approximations to the truth, yet I do not 

 conceive that the inaccuracy in that respect is so great as to affect 

 any geological deductions. 



§ 2. In the western part of Somersetshire, and partly within 

 th6 adjoining county of Devon, there is a large district of high 

 land, the greater part wild and uncultivated, extending about 30 

 miles from east to west, and about 16 miles between north and 



* PI. 23. 



