An overlap proves that a gradual submergence of the land was going on at the time the strata were being accumulated.
"Geology"
James Geikie
Great trunks have been disclosed, and even hazel-nuts and twigs; but it is a big step from the subsidence of some parts of the shore and the consequent submergence of forest land, to the story of the overwhelming of such a land as Lyonnesse, reaching out as far as Scilly and containing many villages and churches.
"Cornwall"
G. E. Mitton
But upon the whole the result was a greater monotony; the revelation of house after house, nearly the same in design, did not gain impressiveness from their repetition; just as the case would be if the dwellings of an old-fashioned cross-town street in New York were dug out two thousand years after their submergence by an eruption of Orange Mountain.
"Roman Holidays and Others"
W. D. Howells