Quaternary fans and terraces of coastal Otago

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SR_1998-011-pdf
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Barrell, D.J.A.; McIntosh, P.D.; Forsyth, P.J.; Litchfield, N.J.; Eden, D.N.; Glassey, P.J.; Brown, L.J.; Froggatt, P.C.; Morrison, B.; Smith Lyttle, B.; Turnbull, I.M. 1998 Quaternary fans and terraces of coastal Otago. Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 98/11 36 p.

Abstract: This report, accompanied by a 1:100,000 scale map, outlines the nature and distribution of fan and terrace landforms and coverbed deposits in the coastal Otago region, from Kaka Point in the south to Moeraki in the north. Quaternary fluvial and marine landforms in coastal Otago have formed under three regimes; low gradient river floodplains to estuaries; alluvial fans; and coast-parallel marine environments. Terraces of fluvial and marine origin were studied in detail at Trotters Creek and Inch Clutha, where both fluvial and marine surfaces interfinger. A chronology of fans and terraces in the region has been developed and related to the international Oxygen Isotope (OI) age scale. The most recent alluvial fans and floodplains, of OI stages 1-6, are widely developed, especially in the Taieri and Inch Clutha basins. Older alluvial fans and floodplain terraces date from at least OI state 8, and occur adjacent to larger rivers and along major fault scarps. Marine terraces date from OI stage 11, and are best preserved in flights rising westward from the present day coast between Dunedin and the Clutha river mouth. Alluvial fans are related to activity on major faults in the region. Preservation of flights of marine terraces is related to uplift on the Titri and Akatore faults. The extensive mid-late Holocene deposits (