How was Rangitoto formed?

Leo

Rangitoto is a small shield volcano, one of many volcanoes in the Auckland monogenetic volcano field. Monogenetic volcano fields are kind of like a big volcano that has been spread out over a large area (instead of all being close together to build a big structure). Rangitoto is mostly lava and formed from the unexplosive building of these fluid basalt flows. There was some fountaining, that produced the cinder deposits up at the top, but most of the activity was very quiet.

Sincerely,
Scott Rowland

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