1872 107 A short distance south of the Fountain Geyser is one of the most remarkable mud-pots in the Fire-Hole Valley.
1943 N. Marsh ix. 147 Alongside the path a mudpot no bigger than a saucepan worked industriously.
1989 5 Feb. xii. 3/1 Mud pots that gurgle and perk and let off more steam.