On the Section of Messrs. Meux & Co.'s Artesian Well in the Tottenham-Court Road, with Notices of the Well at Crossness, and of another at Shoreham, Kent; and on the probable Range of the Lower Greensand and Palæozoic Rocks under London

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Abstract
I n 1851* I expressed an opinion that, as the Upper and Lower Greensands, with the intermediate Gault, cropped out from beneath the Chalk both on the north and south of London, the same strata, in all probability, passed beneath the chalk-basin without break, and that the Lower Greensand might be found available as an additional source of water supply to London. The boring made shortly afterwards at Kentish Town† by M.M. Degousée and Laurent, of Paris, showed, on the contrary, that while the Upper Greensand and the Gault were prolonged as expected, the Lower Greensand was absent, and was replaced, at a depth of 1114 feet, by strata of hard micaceous red and variegated fined-grained sandstones and clays . These were traversed for a thickness of 188 feet, when the work was abandoned. In the absence of fossils, and the confusion produced by the introduction from above of debris and extraneous fossils from the Gault and Upper Greensand, much uncertainty prevailed for a time with regard to the age of these sandstones, which were considered by some as modified forms of the Lower Greensand or the Wealden, and were referred by others to Permian or Triassic strata. From a subsequent examination of the Old Red Sandstone in the neighbourhood of Frome, I came to the conclusion that they belonged to strata of that age‡ as I found the Kentish-Town specimens agreed closely with the Mendip beds in lithological characters, whereas there was, on the whole, a want of agreement with the

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