What is "fieldstones"

Usage examples of "fieldstones".

They had grown up in what had once been a farmer's field—a wall of fieldstones skirted the horse track and disappeared into the wood.

The two Aes Sedai were more interested in the big fieldstones, fifteen or twenty pounds each, being loaded in cups on the end of those arms.

There Patel got out with his burden, walked along the platform and took the escalator up through the tubelike corridor that led to the overpass which avoided the mainline BR tracks: then down the other side again, and out across the open concrete plaza from which jutted several large slabs of ancient wall, not much more than fieldstones mortared together—a remnant of the old days when the City of London was all the London there was, and that tiny square mileage had a proper defensive wall of its own.