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Examples of Beyrich
Progressive development indicated by low grade of early mammals.
Lower Miocene Strata of France.
RUPELIAN CLAY OF HERMSDORF, NEAR BERLIN.
In none of the Belgian Lower Miocene strata could I find any nummulites; and M. d'Archiac had previously observed that these foraminifera characterise his "Lower Tertiary Series," as contrasted with the Middle, and they therefore serve as a good test of age between Eocene and Miocene, at least in Belgium and the North of France.
This clay is more than forty feet thick, of a dark bluish-grey colour, and, like that of Rupelmonde, contains septaria.