Four papers on sediment gravity flow deposits and a melange in the Castlepoint area, Wairarapa, New Zealand

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Van der Lingen, G.J.; Smale, D.; Field, B.D. 1985 Four papers on sediment gravity flow deposits and a melange in the Castlepoint area, Wairarapa, New Zealand. New Zealand Geological Survey: Lower Hutt. New Zealand Geological Survey report SL 8 49 p.

Abstract: The Castlepoint Promontory is formed of the Pliocene (Opoitian) Rangiwhakaoma and thr Pleistocene (Nukumaruan) Castlepoint Formations. The Rangiwhakaoma Formation consists of calcareous siltstone with dolomite concretions, and the Castlepoint Formation consists of rudstone and floatstone limestones. The limestones are sediment gravity flow deposits, probably deposited by debris flows and high-density turbidity currents. After deposition parts of the floatstone strata were deformed through liquefaction, in turn affecting the rudstone strata that acted as confining layers. The tectonics of the promontory are complicated and probably result from a combination of faulting and diapiric ''squeezing'' of the siltstones during the deformation of the North Island Subduction System.