Abstract
Abstract Okahukura Peninsula, Kaipara Harbour, is underlain by rocks of the West Northland Chaos-breccia (emplaced in the upper Oligocene to lower Miocene), Waitemata Group (upper Oligocene to lower Miocene), Waitakere Group (lower Miocene), and Quaternary dune and terrace deposits. The West Northland Chaosbreccia is inferred to underlie the Waitemata Group; it consists of blocks of chert, argillaceous micrite, and glauconitic sandstone, in a matrix of bentonitic clay. The Waitemata Group is represented by the Timber Bay Formation, thin interbedded mudstones and rippled fine sandstones, up to 1000 m thick; it rests on an irregular surface of the underlying Chaos-breccia. The Waitakere Group is divided into three formations. The new Okahukura Formation contains a prominent, coarse igneous conglomerate, the Matapoura Conglomerate Member, and a wide variety of flysch, flysch-like lithologies, mudstones, cross-bedded sands, fine igneous conglomerates, argillaceous micrite breccias, and slumped blocks. There i...
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