Straight from Hard Scrabble Creek, we learn that they’ve been burying offerings in the mud at Saveock since the mid-1600s.
The only valid suggestion we found was that the pits were some sort of offering to St. Bridget or St. Bride the patron saint of brides who has the swan as her symbol. It is said that offerings to her were placed at the branches of three rivers and this area telephone exchange used to be called Threewaters–Saveock water, Blackwater and Chacewater.
This is interesting. I’d have guessed that carbon dating would have placed it closer to the Prayer Book Rebellion than the English Civil War if I were betting — the English killed over 10% of the people in Cornwall in the late 1540s to try to produce religious conformity.
Here’s another article about it.
Help. Spamulated again. In the meantime, you can propitiate me with a nice bottle of red wine.