Stratigraphy of Pokeno District, Auckland

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Abstract
The Te Kuiti Group is represented by small fault-involved blocks of Waikato Coal Measures and Mangakotuku Siltstone, and by good outcrops of Whaingaroa Siltstone (Whaingaroan to Duntroonian). An extension, geographically, of the application of "Waitemata Group", allows the term Waikawau Sandstone to be used for an Otaian basal calcareous sandstone formation. It is overlain by the Otaian Mercer Beds which comprise calcareous siltstones and loose brown sandstones. The Plio-Pleistocene Puketoka Formation was derived from rhyolitic and andesitic rocks, but includes sub-aerial fragments from the local Bombay Basalts which were then erupting contemporaneously, and which are now represented by high-level tuffs and rarer flows which lack an obvious source. The younger Franklin Basalts are interbedded with pumiceous clays of Castlecliffian or Hawera age. (Pokeno Clay), and can be traced to obvious cones. There is no information available as to whether a workable coal seam exists in the Pokeno District. but if one does, there seems no possibility of its being closer to the surface than 1,000–1,500 ft deep.

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