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Geology
| Code | Name | Min age | Max Age |
|---|---|---|---|
| TAP | Tapuaenuku Igneous Complex | 98.0 MA | 98.0 MA |
| TAU1 | Taupo Volcanic Centre | 0.0 MA | 0.523 MA |
| TAU2 | Taupo Volcanic Centre, Taupo Volcanic Zone | 0.027 MA | 0.027 MA |
| TAU3 | Taupo Volcanic Zone | 0.0 MA | 5.3 MA |
| TGA | Tauranga Group | 0.128 MA | 2.588 MA |
| TKA | Taurikura Subgroup | 15.5 MA | 21.5 MA |
| TON | Tongariro Volcanic Centre | 0.0 MA | 2.588 MA |
| VIE1 | View Hill Volcanics, Brechin Formation | 10.899 MA | 53.0 MA |
| VIE2 | View Hill Volcanics | 46.0 MA | 56.0 MA |
| WAI | Waitakere Group | 16.0 MA | 23.799 MA |
| WAL | Wallow Group | 65.0 MA | 99.199 MA |
| WHA | Puhipuhi-Whangarei Volcanic Field | 0.059 MA | 11.199 MA |
| WKA | Waiareka Volcanics | 33.0 MA | 44.0 MA |
| WKU | Wairakau Volcanics | 17.739 MA | 21.0 MA |