Kōrero: Geology – overview

Limestone under the microscope

Limestone under the microscope

New Zealand Cenozoic limestones formed in a temperate climate, and therefore lack tropical elements such as corals. These microscope photographs illustrate different types of limestone formed of the remains of calcareous organisms that lived on the sea floor. Colourless carbonate cement fills the pore spaces between skeletal fragments.

Top left: Potikohua Limestone (Buller). Fragments are mainly bryozoa, with scattered foraminifera.

Top right: Te Aute Limestone (Hawkes Bay). Composed mainly of shell fragments and barnacle plates.

Bottom left: Ōtorohanga Limestone (Waikato). Mainly bryozoa and small foraminifera.

Bottom right: Orahiri Limestone (Waikato). Echinoid spine (centre) with bryozoa and foraminifera.

Te whakamahi i tēnei tūemi

Private collection
Photograph by Cam Nelson

This item has been provided for private study purposes (such as school projects, family and local history research) and any published reproduction (print or electronic) may infringe copyright law. It is the responsibility of the user of any material to obtain clearance from the copyright holder.

Ngā whakaahua me ngā rauemi katoa o tēnei kōrero

Te tuhi tohutoro mō tēnei whārangi:

Eileen McSaveney and Simon Nathan, 'Geology – overview - New Zealand breaks away from Gondwana', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/photograph/8322/limestone-under-the-microscope (accessed 5 July 2022)

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