Palynology of Brunner Coal Measures and Kaiata Formation, Buller Coalfield, South Island, New Zealand

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Pocknall, D.T. 1992 Palynology of Brunner Coal Measures and Kaiata Formation, Buller Coalfield, South Island, New Zealand. Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 92/01. 28 p.

Abstract: This report documents the results of palynological analyses of both outcrop and drillhole core samples collected from the Buller Coalfield in conjunction with work carried out by R.M. Flores (United States Geological Survey, Denver) and R. Sykes (Institute of Geological & Nuclear Sciences Ltd, Lower Hutt). Collections were made during February and March 1989 and again in March 1990. The general location of the areas of sampling (ie. Mt Rochfort, Waimangaroa Gorge etc.) are indicated on Figure 1. Grid references (based on the national 1 000 m grid of the 1:50 000 topographical map series INFOMAP 260) for each of the sections measured and cores examined are given in sections 1 and 3 of the report. Dating of samples from the Buller Coalfield has always been a difficult task as the early work of R.A. Couper, and latterly J.I. Raine indicate. In general, the samples collected for this study have proven just as difficult to work with. The only exception to this are the samples from Charleston,Fly Creek, and Coalbrookdale where reasonably rich palynofloras were obtained. This may be a result of the thermal maturity of the sediments which is shown to vary across the basin of deposition (depth and temperature of burial; see comments later in this report) or the environment of deposition. Where possible, samples are assigned an age in the form of a New Zealand stage and a spore-pollen zone as defined by Raine (1984), here illustrated as Figure 2. By necessity, the dating is based mainly on the abundance of particular species as there are very few first appearances or extinctions in this part of the stratigraphic section. In some cases samples which are barren of palynomorphs can be assigned an age because they are bracketed by two productive samples.