On the Cotteswold, Midford, and Yeovil Sands, and the Division between Lias and Oolite

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Abstract
It has been observed that attention to lithology is likely to insure success in the matter of correlation. I am bound to confess, however, that my experience of Jurassic rocks tells me that in many cases this observation is quite incorrect. Within the limits of one basin it may happen that the same horizon can often be identified by the similarity in lithology; but even within such limits it certainly will not be safe to place much reliance on such a guide; while in correlating the strata of one basin with those of another, such an idea will probably lead to very decided errors. The strata now to be discussed have suffered singularly in the matter of correlation from this similarity of lithology. In the counties of Dorset, Somerset, and Gloucester there occur in most places, between clay of Upper Liassic age and limestone of the Inferior-Oolite period, certain yellow micaceous sands, which contain, at intervals, in some places regular bands, in others lines of more or less lenticular masses, of a hard, greyish, sometimes blue-hearted, sandstone.

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