Tertiary rocks near the white creek fault, Upper Buller Gorge, New Zealand

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Abstract
The steeply-dipping strip of late Eocene to late Oligocene sediments adjacent to the White Creek Fault in the Upper Buller Gorge consists of three somewhat different sequences, juxtaposed by faulting and/or folding. Each sequence contains a disconformity at which sediments of middle Oligocene (late Whaingaroan to Duntroonian) age are mlSSIng. The sediments beneath the dis conformity consist of shallow-water algal limestone and granite-derived sand, and thicken eastwards (towards the Murchison Basin) from 10 to 72 m; those above the disconformity consist of deeper-water calcareous mudstone. The western sequence rests unconformably on basement granite. The other two sequences may represent either sediments originally deposited to the east and folded and faulted by east-west compression, or tectonic slices juxtaposed by transcurrent movement on the White Creek Fault.

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