Following the emplacement of late Pliocene lava domes, lesser activity continued into the Quaternary period (2.58 million years ago to present). Initial volcanism began on the summit of the volcano, depositing lava in and adjacent to the Level Mountain Range. This activity is indirectly dated as Pleistocene age (2.58-0.0117 million years old), on the bases of the presence of subglacial and/or intraglacial deposits. Meszah Peak, the highest point of both Level Mountain and the Level Mountain Range, was volcanically active during this eruptive period.