Abstract
Abstract In the upper Waipaoa catchment, Raukumara Range, the oldest unit is Tikihore Formation (Arowhanan-lower Haumurian, upper Cenomanian-Maastrictian), a 400-m-thick unit of shallow, shelf deposited, alternating sandstone and siltstone beds. This is conformably overlain by Mangatu Formation (upper Haumurian-Runangan, Maastrictian-Eocene), 1100 m thick, which consists characteristically of fine-grained calcareous and quartzose siltstone, minor greensand, chert, carbonaceous siltstone, and fine-grained limestone. Unconformably overlying the Mangatu Formation is 2200 m of Miocene sediments subdivided into the Te Arai and Tokomaru Formations. Te Arai Formation (Altonian-Waiauan, Middle Miocene) comprises a coarse basal igneous conglomerate and alternating blue-grey mudstone and fine sandstone, with minor coquina limestone. This sequence is unconformably overlain by the youngest sedimentary unit, Tokomaru Formation (Tongaporutuan-Kapitean, Upper Miocene), consisting of massive, fine-medium-grained quartzol...
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