Stratigraphy and engineering geology of the lower Wanganui Valley, Koriniti to Parakino

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Abstract
Proposed hydro-electric power development on the Wanganui River, at Atene and alternative sites, required detailed geological investigations. The stratigraphy is revised for structurally simple, uniformly dipping Waipipian-Mangapanian (Upper Pliocene) to Nukumaruan (Lower Pleistocene) strata. Distinct lithologic units are not readily recognised because of lateral facies changes, and the lack of good marker beds makEs broad correlation difficult. Six new formations and one new member are proposed, including three of Superior Oil Co.’s recognised sandstones. They are Koriniti Sandstone, Otui Siltstone, Ahurangi Sandstone, Oxbow Siltstone, Atene Sandstone, Mangaweka Formation, and Cable Siltstone (member). Some engineering geology problems, arising from the investigations, are discussed.

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