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The Taranaki Region of New Zealand is built upon the Median Batholith in the West, and Greywacke Rocks in the East. However, no rocks older than Miocene times are visible at the surface. The dominant feature of the Taranaki Region is the andesitic stratovolcano of Mount Taranaki, which is only about 130,000 years old. The dissected hill country to the East of the Taranaki Peninsula, and West of the Central Volcanic Plateau (Ruapehu and Tongariro) is composed of soft Miocene to Pleistocene sandstone and mudstone. The coastal lowlands around Wanganui to the South have well-developed Quaternary marine terraces, and coastal sand dunes. The Taranaki Basin is the only area in New Zealand with significant known oil and gas deposits, many of them offshore. ==Basement rocks== The Median Batholith lies to the West of a line between New Plymouth and Manaia. To the East of this line are, in order, the Brook Street, Murihiku, Dun Mountain-Maitai, Caples, Waipapa (Morrinsville), and Torlesse (Kaweka) Terranes, mostly composed of Greywacke (apart from the Dun Mountain-Maitai Terrane). All basement rocks are covered by more recent sediments. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Geology of Taranaki」の詳細全文を読む スポンサード リンク
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