The Upper Great Oolite, Bradford Beds and Forest Marble of South Oxfordshire, and the Succession of Gastropod Faunas in the Great Oolite

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Abstract
The line of division between the Forest Marble and Great Oolite in the Oxford district has been drawn at two levels by various writers. As the stratigraphical position of a rich and distinctive lamellibranch and brachiopod fauna is involved, together with that of a few gastropods and corals and the deinosaur Ceteosaurus oxoniensis , the question of the substage to which the beds containing them belong is of more than local importance. The earliest writers on the subject, E. Hull and J. Phillips, who published descriptions of the sections at Kirtlington (Bletchington) Station and Enslow Bridge, about 8 miles north of the centre of Oxford, in 1859 (pp. 20, 21), and 1860 (pp. 117–18) respectively, already held differing views about the position of the junction. Hull, who favoured a higher position than that adopted by Phillips, brought a wide experience of these formations, gained in the Cotteswolds, to bear on the Oxford district. It is significant that Hull's conclusions with regard to the relations of Forest Marble and Great Oolite at Kirtlington and Enslow Bridge were accepted and applied to the neighbouring sections at Hailey, Bladon, Shipton-on-Cherwell railway-cutting, and Islip by H. B. Woodward, who had already travelled over the whole outcrop in the South-West of England in the course of preparing his great work on ‘The Jurassic Rocks of Britain’, and who brought an even greater experience to bear on the subject than Hull (Woodward, 1894, pp. 372–7). There followed in 1908 the Geological Survey Memoir in explanition of the

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