THE GEOLOGIST, 
A MONTHLY RECORD OF INVESTIGATIONS AND DISCOVERIES IN 
GEOLOGY, MINERALOGY AND THEIR ASSOCIATE SCIENCES, 
On the Geology of Central Cheshire, By G. W. Ormerod, Esq., 
F.G.S, 
The part of Cheshire to which this sketch relate is the dis- 
trict lying between the northern edge of the map given in Mur- 
chison^s Silurian System, and the southern extremity of the 
Lancashire coal-field, bounded on the west by the level extend- 
ing in a southerly direction from Frodsham, by Dunham on the 
Hill towards Cheshire, and on the east by the high land reach- 
ing from Stockport by Marple and Macclesfield to Bosley, and 
thence along the range of hills separating Cheshire from Staf- 
fordshire. * * * The keuper and the bunter-sandstein occupy 
almost entirely that part of Cheshire about to be noticed. The 
heuper in Cheshire separates itself into four natural divisions ; 
the supra-gypseous, the gypseous or saliferous, the infra-gyp- 
seous, the water-stone. The bunter-sandstein varies so greatly 
in character, even within very short distances, that he had not 
as yet been able to class the beds satisfactorily ; it was therefore 
treated as one mass. The county of Cheshire was then stated 
to be divided into two parts by a fault commencing at a disloca- 
tion or anticlinal line, found at the Peckforton hills. These hills 
are composed of bunter-sandstein, having the saliferous district 
of Nantwich, Combermere, and Dirtwich on the S. E., and that of 
Aldersey on the N.W. Proceeding in a north-easterly direction, 
from Nantwich, a gently undulating, but deep sandy district is 
passed over, containing the salt-field of Middlewich, Weaver Hall 
VOL. II.— NO. XIII, B 
