Geology of the torlesse supergroup in the southern Liebig and Burnett Ranges, Canterbury, New Zealand

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Abstract
The Torlesse Supergroup of the southern Liebig and Burnett Ranges contains marker horizons of dark bands (thin bedded sandstones and mudstones) and of red and green argillites, containing some chert. Red argillites are in graded contact with ordinary “greywacke” type sandstones, indicating that the two lithotypes corne from the same environment and have not been brought into juxtaposition by tectonic mixing. Most of the folds in the area are steeply plunging and face north. South-facing folds, mostly with sinistral vergence can be found at scattered localities and may indicate an earlier phase of movement under a sinistral regional shear regime or gravity sliding from north or north-north-west. In contrast to the surrounding areas, a large proportion of the beds in the southern Liebig Range is found to young to the east.