Ice marginal lava flow

An ice-marginal lava flow is a lava flow that has impounded against a glacier, ice sheet, ice field or any other body of glacial ice. They commonly display steep lava cliffs from their interaction with glacial ice and can have thicknesses of 100 m (330 ft). Columnar joints with unique patterns can form by rapid cooling of the lava. Ice-marginal lava flows are products of glaciovolcanism.