Page:Memoirs of the Geological Survey of Great Britain, Volume 1.djvu/388

Rh range throughout it. Even, in certain localities, where they are found in shallower water inhabiting the region of corallines, there are reasons, as will afterwards be shown, for believing that such cases are apparent anomalies which may be explained by reference to geological changes.

The following table may be useful as exhibiting at a glance the characteristic features of the several zones of depth in the British Seas.