Geological map of New Zealand 1:50,000 Sheet Q11 Waitakere

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Hayward, B.W. 1983 Geological map of New Zealand 1:50,000 Sheet Q11 Waitakere. Lower Hutt: New Zealand Geological Survey. Geological map of New Zealand 1:50,000 Q11 1 fold. map + 1 booklet

Abstract: The majority of the rocks in sheet Q11 belong to the Waitemata and Waitakere groups of early Miocene (late Otaian-middle Altonian) age. These rocks consist of a number of tilted or gently folded fault-bounded blocks of an overall regional west or northwest tilt. The oldest rocks are interbedded mudstone and graded sandstone (Blockhouse Bay Formation, Waitemata Group) overlain by volcanic and volcanic-derived rocks of the Waitakere Group. Six formations are recognised in the Waitakere Group: (1) Cornwallis Formation -basal volcanic-rich proximal flysch. (2) Nihotupu Formation - fine volcanoclastic lithofacies containing three members: Swanson, Maori Bay, Wairere. (3) Piha Formation - coarse Volcanoclastic litho-facies. (4) Waiatarua Formation (new) -submarine basalt and basic andersite flows, hyaloclastite, and associated intrusives, with three members: Te Henga, Marawhara, Wainamu. (5) Tirikohua Formation local submarine canyon deposits near Muriwai, with four members: Otakamiro, Te Waharoa Conglomerate, Bartrum, South Maori Bay Conglomerate. (6) Lone Kauri Formation - subaerial flows, pyroclastics and associated diatremes and intrusives of andersite and rarely dacite (Watchman Daicite). Quaternary coastal sediments of the Kaihu Group overlap the Waitakere Group in a strip along the west coast. Three formations are recognised: (1) Awhiti Sand - orange-white, coarse sand forming a 150 - 200 m high terrace; (2) Kariotahi Sand -grey, medium sand retaining original dune physiography; (3) Mitiwai Sand - Holocene, grey-black, beach and dune sand. Highly weathered upper Pleistocene alluvium forms three sets of terraces in the northeast of the map area, and Holocene alluvial and swamp sediments cover the floors of many larger valleys

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