Later volcanic activity buried this edifice beneath thin pyroclastic flows. The western edifice generated a complex of lava domes (stage II), which was probably surrounded by a horseshoe-shaped crater open to the west. Possibly, the magma chamber of stage I had almost solidified when the injection of basaltic magma at depths of over triggered a remelting. Andesite-rhyodacite intrusions occurred beneath the volcano, some of which were still hot when the Soncor eruption tore them out of the ground. An ice cap formed over Lascar at that time, feeding two glaciers that extended northeast and southeast away from the volcano.