| Dunedin Volcano | |
|---|---|
| Stratigraphic range: | |
 Basaltic columnar crystals in the "Organ pipes" formation | |
| Type | Igneous |
| Overlies | Waipuna Bay Formation |
| Lithology | |
| Primary | Basalt, trachyte, phonolite and breccia |
| Location | |
| Coordinates | 45°50′53″S 170°38′10″E / 45.848°S 170.636°E |
| Region | Otago |
| Country | New Zealand |
| Type section | |
| Named for | Dunedin |
 Map of selected surface volcanic features of the South Island centred on the Otago Peninsula.
Clicking on the map enlarges it, and enables panning and mouseover of volcano name/wikilink and ages before present. Key for the volcanics that are shown with panning is: basalt (shades of brown/orange), monogenetic basalts, undifferentiated basalts, arc basalts, arc ring basalts, olivine (basalts shades of olive), phonolite (pale salmon), dacite, andesite (shades of red), basaltic andesite, rhyolite, (ignimbrite is lighter shades of violet), and plutonic or intusive (gray) - so dolerite/diabase/microgabbro will have shadings towards gray compared to erupted basalt. | |
The Dunedin Volcano is an extensively eroded multi-vent shield volcano that was active between 16 and 10 million years ago.[1] It originally extended from the modern city of Dunedin, New Zealand to Aramoana about 25 km away. Extensive erosion has occurred over the last 10 million years and Otago Harbour now fills the oldest parts of the volcano.[2][3] The remnants of the volcano form the hills around Otago Harbour (including Mount Cargill, Flagstaff, Saddle Hill, Signal Hill, and Otago Peninsula).
- ^ McDougall, Ian; Coombs, D. S. (1973). "Potassium-argon ages for the Dunedin volcano and outlying volcanics". New Zealand Journal of Geology and Geophysics. 16 (2): 179–188. doi:10.1080/00288306.1973.10431451. ISSN 0028-8306.
- ^ "New Zealand Stratigraphic Lexicon". GNS Science.
- ^ "Volcano Fact Sheet" (PDF). www.gns.cri.nz. GNS Science.