[4] The caldera was formed in a single event paired major eruption, lasting only weeks, that is now dated to 240,000 ± 11,000 years ago.

[5] It ejected more than 340 cubic kilometres (82 cu mi) of rhyolitic Mamaku ignimbrite giving it a Volcanic Explosivity Index of 7.

[2] Ignimbrite, up to 145 metres (476 ft) thick covering about 3,100 km2 (1,200 sq mi), was deposited in the surrounding area, particularly towards the west.

[6][5][2] The outflow dense-rock equivalent (DRE) of the Mamaku ignimbrite Rotorua eruption alone was up to 145 cubic kilometres (35 cu mi).

[1] The circular depression left behind is now filled with Lake Rotorua but the current caldera is more like two ovoids offset from each other, about 22 km (14 mi) in maximum diameter.

[2] It has been postulated that the drainage of the linked deep magma mush body between Rotorua and Ohakuri resulted in more than 250 metres (820 ft) of vertical displacement on the Horohoro Fault scarp.

[8] Understanding that there is volcanotectonic interrelationship lead to a complete reinterpretation of events in the Taupō Volcanic Zone in the last 250,000 years.