Obviously enough,

The sea being where it is, it was the Flood

That left them here.

The Stranger.

Then Noah must have dropped them

Out of his Ark. They never crept so far;

And Noah must have dumped his ballast, too,

Among our hills; for all those rippled rocks

Up yonder were composed of blue sea-clay.

I have found sea-weed in them, turned to stone,