Kōrero: Geology – overview

Tilted limestone bluffs at Kohaihai Bluff (2 o 2)

Tilted limestone bluffs at Kohaihai Bluff

A sheet of limestone was deposited over much of the South Island in the late Oligocene period, about 25 million years ago. As the land began to rise, about 10 million years ago, much of the limestone was eroded, and only remnants are left.

This aerial photograph shows one of these remnants – a thin, resistant band of limestone that forms Kohaihai Bluff, north of Karamea. It is prominent because the softer rocks above and below have eroded. Originally horizontal, the limestone has been tilted up to 50° by uplift of the granite mountains (right). The same limestone band, lying almost horizontal, is found beneath the sea floor to the left.

Te whakamahi i tēnei tūemi

GNS Science
Reference: CN25773
Photograph by Lloyd Homer

Permission of GNS Science must be obtained before any use of this image.

Ngā whakaahua me ngā rauemi katoa o tēnei kōrero

Te tuhi tohutoro mō tēnei whārangi:

Eileen McSaveney and Simon Nathan, 'Geology – overview - New Zealand reborn', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/photograph/8381/tilted-limestone-bluffs-at-kohaihai-bluff (accessed 4 August 2020)

He kōrero nā Eileen McSaveney and Simon Nathan, i tāngia i te 12 Jun 2006