The Occurrence of Detrital Barytes in the Permian Basal Sand at Nitticarhill.

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Abstract
The Permian Basal Sands in South Yorkshire and North-East Derbyshire are very inconstant in thickness and they are often absent or unexposed over wide areas. They evidently filled eroded hollows in the Carboniferous floor and it is interesting to note that they are usually best developed where the underlying Coal Measures are soft and essentially shaly in composition. In the region under discussion some sections show the Lower Permian Limestone resting directly on the basal sand with but a slightly arenaceous base. Such is the case at the well-exposed sections east of Frickley, 15 miles north-east of Sheffield and at Harthill, 10 miles south-east of Sheffield.

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