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Maungarei DacitesCones of Maungarei left and Hikurangi right
Geology of the Parahaki N20 and Opuawhanga N16 areas
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alluvial clays altered Andesitic Basalts Bore Breccia brown brownish Clay Pit clays derived colour comm cracked with L.g. cracks and L.g. cream and hard cream and rairly cristobalite dacite drillholes dull white Dunn feldspar Ferrar figure grey with L.g. halloysite hard with L.g. Hikurangi hole Holocene Horeke Basalts hypersthene iron content Kaikohe Kauri Kear Kerikeri River Lake Omapere light cream linear shrinkage locality Maungaparerua maungarei Maungarei Dacites mile Miocene Mixed Zone molecular ratio mottled Munro Bay N.Z. geol N.Z. Jl Northland Onerahi Opuawhanga pale cream Parahaki Volcanics Paremata parent rock Pene phenocrysts PLEISTOCENE Pliocene poorly plastic clays porphyritic Prime Zone Product at 100°c Pukekaroro Hills Pukekaroro Rhyodacites Putahi Rhyolites quartz rair plasticity rairly hard rrom r-ce rt rrom silica sort with L.g. steel-hard with L.g. Superficial Zone temperatures vitrified Waimate Waimate North Waipapa Group Wairakau Andesitic Breccia weathering Whangarei Whangaroa white clay white with L.g. Zealand