The Bathonian Rocks of the Oxford District.

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Abstract
T his work undertaken at the suggestion of Prof. Sollas, who supervised the work, and at his suggestion a large number of rock-sections have been examined. To Mr. W. W. Fisher, M. A. Public Analyst for Oxfordshire, Berkshire, & Buckinghamshire, I am indebted for much help and many valuable suggestions in carrying out the chemical analyses. I must also express my thanks to Mr. Linsdall Richardson for kindly verifying a number of my identifications, and for his help in the correlation of the beds with those of other districts. My thanks are also due to Mr. R. C. Sikes, M.Inst.C.E., for permission to visit the Ardley Cutting, and to the Directors of the Oxford Portland-Cement Works, who, contrary to their regulations, readily granted me permission to examine their quarry. II. G eneral D escription . The rocks described in this paper form a well-defined series sharply separated from the underlying beds, consisting of the Clypeus Grits on the west and Northampton Sands on the east; and from the Oxford Clay, which nearly always conformably succeeds. Throughout the series there is a general westward thickening, especially marked in the lower members of the Great Oolite. The Cornbrash. This consists of rubbly non-oolitic limestones of various degrees of coarseness containing the normal Cornbrash fauna. The total thickness appears to be only about 17 feet, of which the upper part is characterized by Microthyris lagenalis , the lower by Terebratula intermedia . Cephalopods are far from abundant, there being apparently but two records: namely, Clydoniceras discus from Kirtlington and

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