I860.] PBESTWICB — LOBDOK CLAY IN ETOBFOLK. 449 



The water has been analysed by Dr. Letheby, and reported to be 

 remarkably pore ; and, among other qualifications, to be superior t'< 

 the Artesian veil waters in the London Basin —even the best, sm h as 

 the Royal Mint veil, or that at Unit's Brewery, haying only 3 of 

 hardness after boiling: and it has no commnnication with the Bea. 



The sinking of this well occupied two years. Brickwork, with a 

 bore of I" feel in diameter, was carried to a deptb of 25 feet. < last- 

 iron cylinders, with a bore of 7 feel in diameter, were carried to 

 a deptb of ll 11 feet. A bore-pipe with a diameter of 18 inches was 

 carried to a deptb of 326 feet 9 inches; and -j~> feet was perforated. 



2. On flu Presence of flu LoedohClai '" Nobfolx, as proved by a 



Wi.i.i.- j:«.iii.N'. ai Sabhoi hi. By Josepe Pbsstwich, Esq., 1 .U.S.. 

 Tbeas. G.S., &c. 



Tin northward extension of the London Clay has hitherto been con- 

 sidered to have its limits in the southern part of Suffolk. Its Lower 

 beds outcrop near Ipswich ; at Harwich it is only 23 feet thick; and, 

 as from thence to Bawdsey near Orford, the rise is to the north- 

 ward, the impression is given that the Eocene series ends under the 

 Coralline Crag somewhere about Orford or Aldborough, and that 

 further north the Pleiocene series reposes directly on the Chalk: 

 Mich being in tact their superposition throughout North Suffolk and 

 Norfolk wherever the base of that scries is visible. 



An exception, however, to this order has been proved by a weU- 

 boring ai On ai Yarmouth, which was brought to my notice by tho 

 I.'' . . John Cuiin. l-'.f L.S., of Lrstead. 



It appears that in the year I v h>. the firm of Sir E. Lacon and Co., 

 being desirous of obtaining a Larger rapply of water, had a shaft 

 dug to the depth of 22 feet, and then a boring carried down to tho 

 depth of 597 feet, by Messrs. Clark of Tottenham. Unfortunately 

 this spirited undertaking was nol Bucceasful bo Ear as the water- 

 supply was concerned : but geologists are nevertheless indebted to 

 M jTs. Laeon and Co. for having preserved a full record of the 

 boring, and specimens of the strata penetrated, which have brought 

 to li.Lcht some geological facts of interest. 



< >n either side of Yarmouth the el ill's consist ' I tlder-Clay, with 

 underlying sand- and gravel-beds, ranging for miles in a compara- 

 tively horizontal position. The town is situated on a bank ol 

 and shingle ai the angle formed bj the sea and the River 5 

 the valley of which interrupts the clifibfor a distance of about five 

 miles. Judging by the thickness of the beds between the Boulder- 

 clay and the chalk elsewhere in Norfolk, it might have been infi 

 that the Latter passed under Yarmouth at a depth of from 30 I 

 feet, unless any onusualrj ouring-out of the valley had worn 



a deeper channel at some very bit • 1 period. 



Specimens of the boi taken with great i I I every 



l" fi et or I of depth, and were duly noted ai 1 ; whilst 



a weU-executod oolouri d of th>' well records the general 



