Story: West Coast region

Greywacke and schist

Greywacke and schist

The Southern Alps are formed mainly of hard grey sandstone called greywacke (left), which is the most common rock type in New Zealand. When deeply buried and heated, greywacke is converted to a layered rock called schist (right). The western edge of the Southern Alps has been uplifted many kilometres, exposing schist. The boulders in the main rivers that begin in the Southern Alps are mainly greywacke, with a smaller amount of schist.

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Photograph by Nick Mortimer

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How to cite this page:

Simon Nathan, 'West Coast region - Geology and landscapes', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/en/photograph/21056/greywacke-and-schist (accessed 6 December 2021)

Story by Simon Nathan, updated 1 Sep 2016