An alkali basalt lava flow erupted during the Holocene has a volume of and reached a length of along Jom-Bolok river, reaching the Oka river in a large fan and damming it. This volume is comparable to the volume of lavas emitted during the 1973 Tolbachik eruption, albeit smaller than the Eldgja and Laki eruptions. This volume is unusual for a volcanic field of this size. This large eruptive volume may be linked to the effects of the ending ice age; the melting of the glaciers and resulting unloading of the crust would have resulted in a pre-existing subcrustal pond of magma to drain in a high volume eruption. The extreme length of the flow was likely also helped by the formation of lava tubes within the flow. The northern lava flow during its formation displayed some excellent thermal insulation, and it propagated by a process named sheet inflation where lava flows form thin sheets that subsequently grow to larger flows with a solid crust.