Abstract

X-ray diffraction, scanning-electron microscopy, and chemical analysis show the presence of palygorskite across an unconformity of New Red Sandstone on Torridonian sandstones in northwest Scotland. An expansion of the mineral on glycollation is attributed to the replacement of zeolitic water present in channels in the mineral structure. The origin of the palygorskite is thought to be due to neoformation within a basal Permo-Triassic soil profile, the mineral occurring as coatings on fossil ped surfaces. A semi-arid to arid climate at the time of formation is inferred.

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