The geology of the Mt Stoker area, Eastern Otago

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Abstract
The area mapped, south-east of Middlemarch, is underlain by schist but also includes several small Tertiary outliers of basanitic volcanic rocks resting on a thin formation of quartz sands and conglomerates. In this paper the lithology, mineralogy, and structure of the schist are described. The following conclusions are drawn: (1) bedding in a wide range of thicknesses is recognisable in the schist, (2) the area lies within a biotite and possibly garnet zone of metamorphism, (3) retrogressive metamorphism occurred and appears to have been accompanied by a deformational phase, and (4) there were at least two phases of deformation during the metamorphic period, the first possibly having produced large-scale recumbent folds.