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Published online by Cambridge University Press: 01 May 2009
We wish briefly to state an important result, which the study of certain Tertiary and Cretaceous beds in the neighbourhood of Mons has enabled us to arrive at.
For a long time past, the beds, well known in the district just mentioned, by the name of Tuffeau de Ciply, have been considered by all geologists to be the equivalents of the Maestrichtien, that is to say, as belonging to the highest subdivision of the Cretaceous series of Belgium.
1 Nevertheless, two Maestrichtian forms, Thecidium longirostre, Bosq., and Argipe micioscopica, Schloth., have passed up into the Eocene Tuffeau de Ciply.