. Bulletin of the Natural Histort Museum. Geology series. 82 HOWARTH Haven at the south-eastern end of the bay as the Global Stratotype Section and Point (GSSP) for the base of the Pliensbachian Stage (ie. the world standard definition), is supported by the sequence of ammonites across the Sinemurian/Pliensbachian boundary. All previously figured ammonites from Robin Hood's Bay are listed in a systematic section that includes the evidence on which the ammonite identifications in the paper are based, and 56 of the best preserved ammonites are figured. Eparietites bairstowi sp. nov. is prop
. Bulletin of the Natural Histort Museum. Geology series. 82 HOWARTH Haven at the south-eastern end of the bay as the Global Stratotype Section and Point (GSSP) for the base of the Pliensbachian Stage (ie. the world standard definition), is supported by the sequence of ammonites across the Sinemurian/Pliensbachian boundary. All previously figured ammonites from Robin Hood's Bay are listed in a systematic section that includes the evidence on which the ammonite identifications in the paper are based, and 56 of the best preserved ammonites are figured. Eparietites bairstowi sp. nov. is proposed for an early species of Eparietites and a Sowerby Collection ammonite from the Aplanatum Subzone, Raricostatum Zone, in the bay. is designated neotype of Eoderoceras armatum (J. Sowerby). INTRODUCTION The geology of Robin Hood's Bay (Fig. 1) has received the attention of many geologists since the 1820s. One such geologist was Leslie Bairstow, who decided to make the description of the outcrops of the Lower Lias on the foreshore of the bay (Fig. 2) the main scientific work of his life. He started serious investigations in 1928 and worked in the bay for the next 50 years. Dr Spath, a colleague at the British Museum (Natural History) (now the Natural History Museum, London), identified the many ammonites that he collected and brought to the Museum. As long ago as 1956 Spath (1956: 147) referred to 'the (still undescribed) collections made by MrL. Bairstow in Robin Hood's Bay', but Bairstow was never able to finish a detailed account for publication, and finally he left his work for me to complete. That completion has involved more fundamental work than mere editing: complete rewriting of the stratigraphical section, revision of the maps, preparation of many tables and diagrams not envisaged by Bairstow, and revision of the determinations in order to produce an up-to-date account of the ammonites and the biostratigraphy, were all found to be necessary. The final result is
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