Lytoceratid ammonites from the Inferior Oolite Formation (Middle Jurassic,Aalenian and Bajocian) of Dorset (United Kingdom) |
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| Institution: | 1. Higher Marsh Farm, Marsh Lane, Henstridge, Somerset BA8 0TQ, UK;2. Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK;3. Institute of Geology, Mineralogy and Geophysics, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44801 Bochum, Germany;1. School of Geography & Environmental Science, University of Southampton, Southampton SO17 1BJ, UK;2. Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;3. Independent Researcher, Havant, Portsmouth, UK;1. School of the Environment, Geography and Geosciences, Burnaby Building, University of Portsmouth, PO1 3QL, United Kingdom;2. CGG, Llandudno, North Wales LL30 1SA, United Kingdom;1. 2, Batts Hill, Redhill, Surrey RH1 2DH, UK;2. Earth Sciences Department, The Natural History Museum, Cromwell Road, London SW7 5BD, UK;3. 146, Church Hill Road, Cheam, Sutton, Surrey SM3 8NF, UK |
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| Abstract: | Ammonites of the family Lytoceratidae from the Middle Jurassic Inferior Oolite Formation, Aalenian to lowermost Bathonian, of Dorset are rarely described, perhaps because the macroconchs are often very large and difficult to collect intact and the microconchs are very small and easily overlooked. Detailed stratigraphical collecting over several years has shown them to be a minor part of the ammonite fauna but more common at certain horizons. Four genera, Lytoceras, Megalytoceras Nannolytoceras and Pleurolytoceras have been shown to have different stratigraphical ranges and abundances in the Aalenian and Bajocian but they have not been found in the Lower Bathonian of Dorset. The taxonomic basis of several of the well-known species is poorly described in the literature and is remedied here. |
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