Geology of Te Ikaamaru and Ohau Bays, Wellington

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Riddolls, B.W. 1972 Geology of Te Ikaamaru and Ohau Bays, Wellington. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 144 10 p.

Abstract: An investigation of the geology of the bays has shown that they are formed in hard sandstone and mudstone of the Torlesse Supergroup. Various gravel deposits are distinguishable in the valleys at the head of each bay. Slightly weathered gravel and weak grey silt occurs in the cliffs at the head of Te Ikaamaru Bay, but most of the hilly ground for some 800m to the south appears to be formed by a moderately weathered gravel. These lithologies are not exposed in Ohau Bay, where sub-angular gravels, commonly cemented and containing sand layers, apparently form a thin succession on the west side of the valley. It seems like that faulting was an important mechanism in facilitating the erosion of the bays and the valleys opening into them, but there is no direct evidence for the existence of such faults, nor any indication of recent movement. Owing to the lack of outcrops, precise thicknesses and information on the lithological characteristics of the various deposits can only be determined by determined by geophysical and drilling investigations. (auth)