Auckland - West

Mainly West of Queen Street - seen through my lens

Tholoid

Mangere Mountain

Mangere Mountain

We are on the rim of the main crater of Mangere Mountain (eruption about 20,000 years ago), and bang in the middle of the crater is a hump about 12 metres high — a plug of solidified magma (basalt) that was pushed out of the throat of the volcano after the main eruption by mounting pressure from below. Geologists call that a tholoid. The picture of the lagoon was taken from the opposite position on the rim.

1 Comment

  1. With all that greenery, I would never have thought that this was a crater. Scientists are just amazing.

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