ON THE GEOLOGY OF CENTRAL CHESHIRE. 
5 
beds of clayey stone, forming a saddle ranging from N.N.W. to 
S.S.E. and dipping on the northerly side E. by S. 3"^. These 
strata resemble the beds seen at Preston Hill and Town, there 
overlying the water-stone, and forming the infra-gypseous beds. 
The beds just mentioned as occurring on the S. side of the 
Weaver were penetrated to a depth of 475 feet, at the salt works 
west of Frodsham Bridges, now held by Mr. Pickering, and to 
whose kindness I am indebted for a copy of the borings. A 
weak brine was found at the depth of 288 feet 10 inches. No 
rock salt was detected. The measures consisted chiefly of hard 
and gritty beds. A shaft was sunk at the above works near the 
side of the river, to the depth of 30 yards, and then abandoned. 
These measures in the upper beds contained a little spar ; but 
they were generally gritty, with bands of a ferruginous nature, 
very hard ; so much so, as to require blasting. The salt manu- 
factured here is made from the salt water of the Mersey, 
strengthened by rock salt brought from Northwich. To the N. 
of the Weaver, the infra-gypseous water-stone and bunter-sand- 
stein beds occur, occupying a range extending fromGrappenhall to 
Mere. A fine section of the whole series of beds is given by de- 
scending Bradley Brook. Impressions of the footstsps of the 
Lahyrinthodon platypus are found in the lowest beds of the water- 
stone at Lymm. Between Lymm and Warburton, a fault of 
about 400 yards exists. Water- stone is again found at War- 
burton, very much broken. Salt-springs are found at Dunham, 
Mill Bank and Woolden. The country between this line and 
Altrincham, by Carrington Moss, has not yet been examined. 
To the west of the river Weaver successive ranges of water-stone 
and bunter-sandstein extend from Hill Cliff to Kuncorn, — the 
result of a series of dislocations causing the recurrence of the 
same beds three times in that distance. The part of the bunter- 
sandstein between Halton and Runcorn point is so much broken 
as to render a minute description impossible within our limited 
space. Between Runcorn and Higher Runcorn, buried under 
