plug dome

plug dome

[′pləg ‚dōm]
(geology)
A volcanic dome characterized by an upheaved, consolidated conduit filling.
References in periodicals archive ?
Eruptions from 1914 to 1921 put this 10,457-foot plug dome on the map.
If the dome plugs the vent, it is called a plug dome volcano.
Cinder cones (which resemble anthills) and plug domes (wherein thick, sticky lava cools and builds up the mountain, layer by layer, eventually plugging its own hole) are also scattered throughout the park.