On the Correlation of the Eocene Tertiaries of England, France, and Belgium

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Abstract
I. Introductory. Searls V. Wood, as is well known, regarded the shell-bed of Walton-on-the-Naze, with its strongly-marked southern fauna, as older than any other part of the Red Crag, grouping the rest of that formation, in which northern shells occur more or less abundantly, under the name of the Crag of Sutton and Butley,1 although he believed that of the latter locality to be the newer of the two2 Prestwich, on the other hand, maintained that all the Red Crag beds, and to some extent the Norwich Crag also, were contemporaneous3; and this view is, I believe, still held by no less an authority than the ex-President of the Geological Society.4 In the face of such a difference of opinion, it seemed to me necessary to return to the subject, in order that, if possible, some more definite conclusions might be arrived at. In the hope therefore of obtaining further evidence as to the correct classification of these beds, I have spent my leisure time during the past five or six years in revisiting every part of the Crag district, and in the examination of all the more important collections of Crag fossils. The view that the Red Crag deposits are all of the same age appears, at first sight, not unreasonable, though it is not so easy to understand why those of the Norwich Crag should have been grouped with them. As to the former, many, perhaps most, of their more characteristic mollusca are found in every part of

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