Tertiary and early Quaternary Geology of the Naseby and Kyeburn areas, Central Otago

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Abstract
The Tertiary sequence at Naseby and Kyeburn consists of the Hogburn Formation, terrestrial quartzose sediments of probably Arnold age, overlain by the marine Naseby Greensand (Whaingaroan-Duntroonian) and succeeded by a further terrestrial suite, the Wedderburn Formation. This transgressive-regressive sequence is aggregated into the new Stranraer Group, and is overlain, probably unconformably, by the piedmont gravels of the Maori Bottom Formation. The Dansey Gravels Formation, formerly considered a transitional unit between the Wedderburn and Maori Bottom Formations is discredited as a valid unit. At Naseby and Kyeburn the Stranraer Group was deposited during rather stable epeirogenic conditions. Both the Naseby and Kyeburn areas were close to the point of maximum marine transgression, and at Kyeburn non-marine and probably marine beds interdigitate. Thick deposits of Maori Bottom gravels, shed from rising fault scarps during the Kaikoura orogeny, overlie the Stranraer Group in both areas. A maximum age of Opoitian has been obtained for a blue-grey gravel phase of this formation. Both the Stranraer Group and Maori Bottom Formation are deformed, locally severely, where associated with faults, indicating important movements probably persisted into the Pleistocene.

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