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Geology
| Code | Name | Min age | Max Age | Volcanic Sites |
|---|---|---|---|---|
| AK | Auckland Volcanic Field | 0.0 MA | 0.14 MA | 53 |
| AKA | Akaroa Volcanic Group | 8.0 MA | 9.1 MA | 1 |
| ALX | Alexandra Volcanic Group | 1.6 MA | 2.92 MA | 3 |
| ARN | Tauperikaka Coal Measures, Whakapohai Sandstone, Arnott Volcanics | 60.0 MA | 84.0 MA | - |
| BOI | Kaikohe-Bay of Islands Volcanic Field | 0.059 MA | 11.199 MA | 8 |
| BRO | Brothers Volcanics | 21.7 MA | 27.299 MA | - |
| BST | Brook Street Volcanics Group | 245.0 MA | 299.0 MA | - |
| COO | Cookson Volcanics Group | 26.5 MA | 31.0 MA | - |
| COR | Coromandel Volcanic Zone | 1.2 MA | 18.5 MA | 12 |
| DEB | Deborah Volcanics | 29.0 MA | 33.0 MA | - |
| DEV | Devil River Volcanics Group | 477.0 MA | 545.0 MA | - |
| DIA | Diamond Harbour Volcanic Group | 5.8 MA | 8.1 MA | 4 |
| DUN | Dunedin Volcanic Group | 10.0 MA | 21.0 MA | 85 |
| EGM | Egmont Volcanic Centre | 0.0 MA | 2.588 MA | 5 |
| GRA | Grasseed Volcanics | 42.7 MA | 53.099 MA | - |
| HER | Mount Herbert Volcanic Group | 8.0 MA | 9.699 MA | - |
| KAR | Karewa Volcanic Formation | 0.51 MA | 0.51 MA | - |
| KAT | Kathryn Metavolcanics | 486.2 MA | 513.0 MA | - |
| KIW | Kiwitahi Volcanic Group | 5.5 MA | 16.0 MA | 4 |
| LIV | Livingstone Volcanics Group | 248.0 MA | 295.0 MA | - |
| LYT | Lyttelton Volcanic Group | 9.699 MA | 11.0 MA | 1 |
| MAN | Mangakino Volcanic Centre | 0.136 MA | 1.809 MA | 1 |
| MAN1 | Mangakino Volcanic Centre, Taupo Volcanic Zone | 0.649 MA | 0.769 MA | - |
| MAR | Maroa Volcanic Centre | 0.0 MA | 0.523 MA | - |
| MAT | Matakaoa Volcanic Group | 65.0 MA | 98.9 MA | - |
| NHP | Ngahape Volcanic Complex | 58.0 MA | 80.0 MA | - |
| NTT | Ngatutura volcanic field | 1.54 MA | 1.83 MA | 3 |
| OKA | Okataina Volcanic Centre | 0.0 MA | 0.74 MA | 3 |
| OTH | Other volcanic areas | 0.0 MA | 146.0 MA | - |
| PAR | Park Volcanics Group | 205.0 MA | 215.0 MA | - |
| RAN | Rangiawhia Volcanics | 104.0 MA | 131.0 MA | - |
| REP | Reporoa Volcanic Centre, Taupo Volcanic Zone | 0.219 MA | 0.239 MA | 1 |
| RIP | Rip Volcanics | 98.9 MA | 142.0 MA | - |
| ROT | Ohakuri, Kapenga and Rotorua volcanic centres | 0.0 MA | 0.523 MA | 2 |
| ROT1 | Ohakuri, Kapenga and Rotorua volcanic centres, Taupo Volcanic Zone | 0.128 MA | 0.523 MA | - |
| SAK | South Auckland Volcanic Field | 0.071 MA | 1.59 MA | 81 |
| SOL | Solander Island Volcanics | 0.15 MA | 0.4 MA | - |
| SOM | Mount Somers Volcanics Group | 79.0 MA | 98.5 MA | - |
| TAH | Tahuna Volcanic Centre | 6.4 MA | 6.8 MA | - |
| TAN | Tangihua Complex | 28.5 MA | 146.0 MA | - |