An indication of depositional environment and hence of the occurrence of potential reservoir facies is provided by estimations of paleosalinities based on the content of boron in illite. Boron-salinity logging of the lower part of the Carboniferous Yoredale section exposed in the Hawes area of Yorkshire shows that it is possible to distinguish between the fine-grained deltaic sandstones characteristic of Yoredale cyclothems and a coarser-grained porous type of sandstone representing a marginal marine facies on the basis of their respectively low and high contents of equivalent boron.

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