A cluster of 14 volcanic plugs are exposed that were originally under the central part of Maitland Volcano. These form steep-sided, isolated monoliths that reach heights of above the surrounding eroded terrain. They are circular to elliptical in shape, ranging in diameter from . The plugs represent the principal feeders through which the Maitland lavas reached the surface. Red oxidized pyroclastic blocks surround some plugs protruding through the remaining lava flows. These probably formed not far below the surface where eruption was accompanied by vent-clearing explosions.