On the Thickness of the London Clay; on the Relative Position of the Fossilferous Beds of Sheppey, Highgate, Harwich, Newnham, Bognor, &c.; and on the Probable Occurence of the Bagshot Sands in the Isle of Sheppey

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Abstract
H aving frequently had my attention directed by Mr. Searles Wood to the question of the exact position in the London Clay of the peculiar and remarkable fossiliferous beds of Sheppey, and of the thickness of the London Clay itself at that place, I have, with that special object in view, made a further examination of the Island, and now beg to lay before the Society the result of these observations. I have availed myself of this opportunity to determine also more correctly the importance of the London Clay in other parts of its range, and to settle approximately the position of the strata of some other localities, well known for their fossils—separate lists of which I give at the end of this paper. This question of the thickness of the London Clay remains nearly in the state in which it was left by Phillips and Conybeare in 1822. The impression likely to be conveyed by the observation on this subject in their valuable work* is one which would suppose its development to be more irregular, and in places considerably greater, than will, I believe, prove to be the case. They state,—" The actual thickness of the London Clay in Sheppey may be estimated, by adding the height of the cliff to the depth of the wells, at 530 feet.” They then proceed to say that “it may be supposed to be much thicker in Essex,” estimating it at “High Beech to be about 700 feet thick;” and further, they report

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