Note 233 — Chapter XVIII

We must not, however, suppose that the whole of this immense tract was always morass. Oscillations in the land level have more than once raised it high enough and long enough for great forests to clothe it; the trees of which, frequently of giant size, are constantly exhumed from the peat which the later depressions have formed over them.[233] The last of these forests seems to have lingered on into Roman times. A Roman roadway may still be traced, running east and west across the whole breadth of the district, from Denver, at the south-western point of the Norfolk uplands, to Stanground, near Peterborough, on the Huntingdonshire mainland. The Fens must have been very different from what they afterwards became for such a road to be in use. But before the collapse of Roman Britain in the fifth century of our era all seems to have gone to fen once more; and the islets in it served as a refuge for the remnant of the British population when the flood of the Anglo-Saxon Conquest burst over the land.[234]