138 PAPERS, ETC. 
On the Geologienl Farmations in the 
Hrighkoncham af Dungter. 
BY REV. W. ARTHUR JONES, M.A. 
LL the lofty hills and high land in this distriet, in- 
eluding Dunkery Beacon, the north hill at Mine- 
head, Grabhurst Hill, and the Croydon range, with the 
outlying Quantocks, belong to a geological formation, 
which for a long time was known as the Grauwacke, but 
is now more frequently called the Devonian series. On 
the declivities and near the base of these hills, we find 
another series of rocks of more recent origin, which, while 
they skirt the upheaved masses of the older formation, in 
many places rest upon them in such a manner as clearly to 
prove that they were deposited after and upon the older 
sedimentary formations. These rocks are known as the 
red-sandstone series, which, for the most part, compose 
the lower hills, and supply the characteristice red marls of 
the lowlands. The red-sandstone, in its turn, is succeeded 
by later formations. Hence we find the Zas overlying the 
red-sandstone along the coast of the Bristol Channel, and 
