The Palæntological Sequence in the Carboniferous Limestone of the Bristol Area

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Abstract
I. I ntroduction . T his paper deals with the fossil sequence in the Carboniferous Limestone of the Bristol area, and with the possibility of dividing that system into a series of palæontological zones. The general geology of the area has been most luminously expounded by Prof. Lloyd Morgan in the series of papers which he has contributed to the Proceedings of the Bristol Naturalists' Society, and to these I make constant reference. I am thus able largely to dispense with detailed accounts of topography and lithology, which would otherwise interrupt seriously the palæontological discussion. Mr. E. B. Wethered has contributed a most instructive paper Q.J.G.S. No. 242. ‘On Insoluble Residues obtained from the Carboniferous-Limestone Series at Clifton,’ and it is with his lithological divisions that I have mainly correlated the palæontological zones suggested in this paper. To the late Mr. W. W. Stoddart we owe the first attempt to compile a list of the fossil contents of the beds in the Avon Section. I have drawn up a complete analysis of his observations, so far only as the Corals and Brachiopods are concerned; this will, for convenience, follow immediately upon the detailed account of my own observations on the Avon section. For my purpose, it is obvious that the essential desiderata are good exposures, the relative stratigraphical position of which is unquestionable. Exposures which satisfy these two conditions are to be found in several parts of the Bristol area, and, from them, the determination of the faunal sequence is merely a matter

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