On the Nature and Relations of the Jurassic Deposits which underlie London

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The well and bore-hole (see fig. 1, p. 744) which have revealed the particulars of the strata described in this paper are sunk on the premises of the Richmond Vestry Waterworks, situated about 160 yards below Richmond Bridge, on the right bank of the Thames. The common centre of the well and bore-hole is about 33 yards distant from the high-water line of ordinary spring tides. The altitude of the surface of the bore-hole is about 17 ft. above Ordnance datum. The well, which has an internal diameter of 7 ft. at top and 5 ft. at the bottom, was sunk in 1876 for the purpose of supplying water to the town of Richmond, and was carried down to the Chalk, which was met with at 253 ft. below the surface. From the bottom of the well a 24-in. bore-hole was further sunk to the total depth of 434 ft., thus penetrating 181 ft. into the Chalk. This well and bore-hole were completed in the summer of 1877. The Tertiaries passed through were represented by 160 ft. of London Clay, 60 ft. of the Woolwich and Reading beds, and some underlying sands. Down to 434 ft. the writer of this notice was in no way connected with the carrying out of the work; Messrs. Russ and Minus being the engineers under whose direction the well and bore-hole to the depth before stated were executed. Samples of the Tertiaries passed through were kept, and can be inspected at the office of