Story: Geology – overview

Bedding in Greenland Group (2nd of 2)

Bedding in Greenland Group

These steeply tilted beds of Greenland Group greywacke and argillite are exposed on the coast north of Greymouth. The beds are cut by almost vertical cleavage, which appears as closely-spaced cracks on the outcrop. Geologists can measure the angle between the bedding and cleavage to analyse the way that the rocks have been deformed.

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Photograph by Judith Nathan

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How to cite this page:

Eileen McSaveney and Simon Nathan, 'Geology – overview - New Zealand’s oldest rocks', Te Ara - the Encyclopedia of New Zealand, (accessed 13 August 2022)

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