This tabby made me think of the wattle and daub I heard about in a spiel at Plymouth (Plimouth, take your pick--!). I just check MW online, and there I read that daub was a kind of clay--no shells were mentioned there--but it was surprising that the reference date for the entry was 1808, long after Plymouth colony. Hmmmmm....what gives here?

Also, I'm not going to start a new thread because someone might know here whether shells were in the daub.