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

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Abstract
In my paper of June 1854 I expressed an opinion that the lower members of the Sables Inférieurs of France,—the Landenian and Lower Ypresian Systems of Belgium,—and the Thanet Sands, Woolwich series, and London Clay of England, formed a natural and well-marked geological division of the Eocene Tertiaries, to which, as their development is most complete in this country, I proposed the term of the “London Tertiary Group.” Above this group commences a new order of things; the rich fauna of the Calcaire grossier extends over the French, Belgian, and English areas, accompanied by a profuse exhibition of nummulites—a feature the more marked from the absence of these Foraminifera in the underlying London Group. For this next overlying series I have proposed the name of the “Paris Tertiary Group”. The commencement of the Paris Group is in England represented by the unfossiliferous Lower Bagshot Sands, in Belgium by the partially fossiliferous Upper Ypresian System, and in France by the nummulite-bearing Lits coquilliers and associated sands of M. D'Archiac, or the Glauconie moyenne of M. Graves. With the evidence bearing on the synchronism of these beds I concluded my former paper, and I now propose to consider the exact correlation we should assign to the Bracklesham Sands and to the Barton Clay.

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