Story: Geology – overview

Banks Peninsula – extinct volcanoes

Banks Peninsula – extinct volcanoes

This aerial view shows Bank Peninsula, with the snow-covered Southern Alps in the background. Akaroa Harbour is at the centre left. Volcanic activity between 11 and 6 million years ago led to the formation of two overlapping volcanic cones. After this activity ceased, the volcanic complex became eroded to half its original height, and deep valleys formed. The present harbours at Akaroa and Lyttelton were formed when the valleys were flooded as the sea level rose to its present height about 6,000 years ago.

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Reference: CN23557
Photograph by Lloyd Homer

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How to cite this page:

Eileen McSaveney and Simon Nathan, 'Geology – overview - New Zealand reborn', Te Ara - the Encyclopedia of New Zealand, (accessed 15 July 2024)

Story by Eileen McSaveney and Simon Nathan, published 12 Jun 2006