On 2 December 1972, Joan Wiffen, her husband, son and daughter started a camping trip. But it was far from ordinary. They were obsessed fossil-hunters and they were deep in the largest rainforest of New Zealand's north island at a spot by a river described casually in an old geological map as having “Saurian” bones.

For Joan, as she started to search for remains, it was “like opening up the Christmas stocking". At the time, scientists believed dinosaurs had not inhabited New Zealand. With the help of archive audio, Joan’s son Chris Wiffen describes how his mother, who left school at 12 and had no qualifications, would meticulously search the rainforest site and go on to find the tailbone of a theropod dinosaur – turning scientific beliefs on their head.

He describes to Josephine McDermott how his mother devised her own DIY palaeontology lab in their garage and he would visit from university to find her surrounded by acid baths where the rocks she excavated would yield their fossils. “They had visitors from world-renowned palaeontologists and they’d say ‘Oh my gosh. Look at this. Unbelievable’. And it was.”

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Archival audio in this broadcast was from the Radio New Zealand collection at Ngā Taonga Sound & Vision.