6 
THE GEOLOGIST. 
the drift, is a fault_, separating tliat range of hills from the one 
just described. A small synclinal axis runs between Weston 
and Rock Savage. To the S. of the trough of the Weaver, lies 
the great range of the hills of Delamere Forest. These consist 
chiefly of bunter-sandstein. Water-stone is found near Kelsall 
and near Utkinton. It is impossible here, however, to enter 
into a detailed description of the forest. To the south of the 
forest range, lies the extensive flat containing the salt measures 
of Aldersey. The thickness of the salt-measures, computed from 
borings at Wincham, North wich, and the upper part of the 
Frodsham borings, was stated to be more than 354 yards. The 
thickness of the infra-gypseous beds along Bradley Brook, was 
stated to be upwards of 80 yards ; and that of the water-stone 
beds along the same brook 100 yards. The thickness of the 
bunter-sandstein beds could not be estimated ; but at Hill Chff 
it is more than 350 feet. Two faults were shown to extend 
from S.W. to N.E. ; one, along the eastern boundary of the 
county by Mow and Cloud, and the other the gi-eat Peckforton 
fault. Two others ranged from N.W. to S.E. ; one extending 
from Madely to the N. of Nantwich, between Beeston and Tar- 
porley, and thence skirting the high ground by the S. of Dela- 
mere Forest. The seoond was formed by the trough of the 
Weaver at North wich. A fault was shown to range from E. to 
W. running partly along the Mersey between Lymm and War- 
burton, below Altrincham, and between Timperley and Barlow 
Hall. Of none of these dislocations had the extremities as yet 
been determined. — Transactions of Manchester Geol. Soc. 
Ehrenbe7'g^s Notices of American Infusoria. 
On the 25th of March, 1841, M. Ehrenberg made a commu- 
nication to the Boyal Academy at Berlin, in which he referred 
to specimens of American fossil infusoria sent for his examina- 
