. Bulletin of the British Museum (Natural History), Geology. The photographs shown in the plates were taken by the author, and the specimens were given a thin coating of ammonium chloride. All figures are natural size unless stated otherwise. Acknowledgements I wish to thank Mr W. N. Terry and Northampton County Borough Council for the loan of many ammonites from Beeby Thompson's collection; also Mr Gordon Osborne of the Northampton- shire Natural History Society and Field Club, Dr H. C. Ivimey-Cook of the Institute of Geological Sciences, Mr J. M. Edmonds of Oxford University Museum, Dr S. Tu
. Bulletin of the British Museum (Natural History), Geology. The photographs shown in the plates were taken by the author, and the specimens were given a thin coating of ammonium chloride. All figures are natural size unless stated otherwise. Acknowledgements I wish to thank Mr W. N. Terry and Northampton County Borough Council for the loan of many ammonites from Beeby Thompson's collection; also Mr Gordon Osborne of the Northampton- shire Natural History Society and Field Club, Dr H. C. Ivimey-Cook of the Institute of Geological Sciences, Mr J. M. Edmonds of Oxford University Museum, Dr S. Turner latterly of Reading University and Mr M. D. Jones of Leicester City Museum for ready access to collections in their Fig. 1. Map of the outcrop of the Middle and Upper Lias (hatched) in the western half of Northamptonshire, showing all the localities referred to in the text. The Lower Lias occurs to the north-west and the Middle Jurassic to the south-east. Stratigraphical succession The stratigraphical succession of the Upper Lias of Northamptonshire was worked out almost single-handed by Beeby Thompson in a long series of papers between 1881 and 1910. Earlier descriptions of the Middle and Upper Lias in the neighbourhood of Banbury by Beesley (1873) and Walford (1878) had included sections at Byfield and Eydon in west Northamptonshire, and it was in their descriptions that the terms Transition Bed, Fish Bed and Cephalopod Bed originated for sections in that area. Nearer Northampton, however, no detailed description existed for the Middle and Upper Lias, and Thompson obtained his information from the numerous quarries in the Marlstone Rock Bed and brickpits in the clay facies of the Upper Lias that existed at that time. His description (Thompson 1881-86) started with the succession revealed by the quarrying of the Marlstone Rock Bed, both as iron-ore and as building stone, at about 30 localities in the 237. Please note that these images are extracted from scanned pag
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