Book excerpt: Did the entire New Zealand land mass sink beneath the waves 23 million years ago? Many biologists reject the idea and insist that our native terrestrial fauna can be explained only by the continuous existence of land. But many geologists are now asserting that there is no longer any convincing geological evidence that the New Zealand section of Zealandia remained above the sea’s surface. But if Zealandia did sink completely beneath the waves 23 million years ago – where did our distinctive ancient flora and fauna such as the tuatara and our tree ferns come from? This BWB Text is a provocative treatment of the ‘Drowning Zealandia’ scientific controversy by geologist Hamish Campbell.