Geologist Heather Nicholson stands in front of greywacke outcrops on Waiheke Island, near Auckland. In 1953 she wrote her master’s thesis on the island’s geology and in 2003, exactly 50 years later, she submitted her PhD thesis with the title, ‘The New Zealand greywackes: a study of changing geological concepts to 1985’.
In the sound clip she talks about the way the term greywacke has been used in New Zealand.
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Sound file courtesy of Simon Nathan
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