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.