The Evidence for a Non-Sequence between the Keuper and Rhætic Series in North-West Gloucestershire and Worcestershire

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Abstract
During my investigations of the Rha3tic Series in Worcestershire and North-West Gloucestershire, the results of which are in part chronicled in the 'Proceedings of the Cotteswold Naturalists' Field- Club' 1 and in the 'Geological Magazine,' : two facts were most noticeable. The first was that above a particular bed in the Rhu3tic Series the remaining component deposits were remarkably persistent; while the second was that below that stratigraphical horizon such persistency was not found. The stratigraphical horizon referred to is that of the well-known Bone-Bed of the sections at kust and Garden Cliffs, and of the less-known Bone-Beds at Wainlode and Sedbury. The stratigraphical details may be dealt with first. In most of the sections in Worcestershire a massive bed of sandstone is the equivalent of the thin pyritic Bone-Bed which is so crowded with vertebrate-remains at Garden Cliff, and the contemporaneity of these deposits might be at first doubted. Wainlode Cliff, however, furnishes the clue to the whole question, for in that cliff-section may be observed the change from a thin pyritic stratum (only an inch or so thick) to a micaceous sandstone-bed, usually devoid of vertebrate-remains, and about a foot thick. The latter development, however, contains in some abundance those equivocal casts to which the name of Pullastra arenicola has been so frequently applied; and also a broad form of what appears to be Modiola minima -but only as obscure casts. The point, however, to which attention is particularly directed is the gradual transition between the two varieties of

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