Resta Road slide : a re-evaluation of an area of hummocky terrain in the Gibbston Basin, Central Otago

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Thomson, R. 1994 Resta Road slide : a re-evaluation of an area of hummocky terrain in the Gibbston Basin, Central Otago . Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 94/33 29 p.

Abstract: The ''Gibbston Moraine'', defined by a hummocky landform in the south-west segment of the Gibbston Basin, has until recently been accepted as a late Otiran glacial deposit. A widely referenced chronology has been developed for the event and related fluvial sediments in the Kawarau catchment. Recent geological mapping indicates that the hummocky landform is not of glacial origin but is part of a large landslide which is inferred to have resulted from the collapse of a glacially oversteepened schist slope approximately 500 000 years ago. A rapid failure produced a 2.5 kM 2 area of highly comminuted and disrupted schist that may be up to 100 m in thickness. The schist debris within the slide area is uniform in character and the textural similarity with to the surrounding in situ schist points to a local derivation. Known glacial deposits in the area are restricted to the Camp Creek stream channel, south-east of the landslide. (AUTHS)