Stratigraphy and sedimentology of the Waitemata Group, Puketotara Peninsula, Northland

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Abstract
The lower Miocene Waitemata Group on Puketotara Peninsula has been formally divided into three formations: (a) the proposed Timber Bay Formation (?Waitakian-Otaian) composed mainly of thinly interbedded sandstones and mudstones, an intraformational conglomerate, and a channel-fill deposit; (b) the Pakaurangi Formation (Otaian-?Hutchinsonian) containing sandstones and pebble bands of the Hollands Member, richly fossiliferous silty sandstones locally intruded by basalts, all belonging to the Pakaurangi Member, and sulphurous, sandy siltstones of the Funnel Member; and (c) the proposed Motuouhi Formation (?Hutchinsonian) consisting of dark brown vitric tufts. Also included in the Waitemata Group is the informal Waipahihi formation which overlies the Motuouhi Formation. Petrographic studies indicate the sediments were derived mainly from andesites with minor contributions from microdiorites, greywackes, and limestones. The sediment appears to have been transported from the north-east and was deposited in a tectonically active, marine sedimentary basin which existed in the central Kaipara region in lower Miocene times.

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