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Updated: May 18, 2025
An unconformity between two marine formations records the fact that between the periods when they were deposited in the sea the area emerged as land and suffered erosion.
It has already been stated that the syenite and some other rocks of the Norfolk till seem to have come from Scandinavia, and there is no era when icebergs are so likely to have floated them so far south as when the whole of Sweden and Norway were enveloped in a massive crust of ice; a state of things the existence of which is deduced from the direction of the glacial furrows, and their frequent unconformity to the shape of the minor valleys.
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