Abstract
It will be of interest therefore to give a full account of these borings, of which only short notices have yet appeared, and to review the bearing that the result of the later one has on our knowledge of the underground formations of the London Basin. The borings are about 210 yards westward of the Factory Basin, in what was, until the extension of the docks was made, the marsh on the southern side of the former St. Mary's Creek, that creek having also been included in the new dockyard. The surface of the ground is about ten feet above Ordnance Datum. The earlier boring, which reached Lower Greensand at a depth of over 903 feet, being of small size, in the lower part at all events, it was resolved to put down another and larger one near by, in order to get a large amount of water from the Lower Greensand; and it is to the second boring that this paper chiefly refers, because of the unforseen result. One would have thought that Chatham was favourably placed for getting a large suply of water from the Lower Greensand, which formation has a broad outcrop only a few miles to the south. It was therefore with some surprise that one heard that, after passing through only 41 feet of sandy beds (below the Gault), a mass of clay was reached at the depth of 943 feet. At first this clay was naturally taken to be either a very clayey development
Published Version
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