otagogeology_mtzion_2020_cr.jpg This view from Mount Zion, on Mount Cargill’s northeast summit ridge, shows the complex structure of the ancient Dunedin Volcano, now heavily eroded. Dr Palin said there was a strong case for considering the potential use of geothermal energy. PHOTO: DR SOPHIE BRIGGSIn Dunedin, the main users of heat were Dunedin Hospital, Otago University and the central business district. Dr Palin said the eroded Dunedin Volcano visible today represented "only the tip of the iceberg in terms of the ancient magma system". This compound volcano was partly formed from successive layers of basaltic lava, but also includes broken volcanic rock called tuff.

Source: Otago Daily Times April 07, 2021 16:30 UTC