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Examples of Oligocene
Progressive development indicated by low grade of early mammals.
Lower Miocene Strata of France.
Silurian, derivation of the name.
Although some of the German lignites called Brown Coal belong to the upper parts of this series, the most important of them are of Lower Miocene date, as, for example, those of the Siebengebirge, near Bonn, which are associated with volcanic rocks.
None of these occur in the London Basin, and they occupy in that of Hampshire, as we have seen in Chapter 15, too insignificant a superficial area to be noticed in a map on this scale.
In the map in Figure 164, the position of several Eocene areas in the north of Europe is pointed out.