A read another book on pre-Columbian archaeology some time ago - I can’t remember the title. It had a section in there about Viking mooring holes. The author claimed that Vikings regualrly used a characteristic mooring hole, drilled into the side of a rock along the shore into which a metal bar was dropped and a mooring line fastened from their ships.
Such morring holes have been supposedly found quite far south along the Atlantic Sea Baord, well into New England.
Look at the Coast of Maine and Mass, all kinds of Rivers to explore, all the way down to the Cape. What lies under 400 years of settlement?
The problem with stone anchors is, they’re not too stylish, so a stone anchor lost in ancient times would only be generally accepted if it’s found in the “right” place. :’) Mooring stones — interesting, I’d read that too, but forgotten about it. Thanks Zulu.