The Middle Jurassic stephanoceratid ammonite Kumatostephanus from Dorset and Somerset,UK, and its evolution |
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| Authors: | Robert Baron Chandler John Whicher Wolfgang Grulke Andy Cowap |
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| Institution: | 1. Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK;2. Higher Marsh Farm, Marsh Lane, Henstridge, Somerset BA8 0TQ, UK;3. Grange End House, Oborne, Dorset DT9 4LA, UK;4. 70, Crescent Road, Portwood, Stockport SK1 2QQ, UK |
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| Abstract: | A new exposure at Oborne, Dorset has yielded a rich fossil assemblage of the Lower Bajocian ammonite Kumatostephanus from the Laeviuscula and Humphriesianum zones. The principal bed containing this ammonite, the Green Grained White Marl is locally diachronous; it is an important local marker horizon and it is herein proposed as a formal stratigraphical unit. The specimens obtained allow a better understanding of the evolution of the genus Kumatostephanus and its relationships to the other stephanoceratids, notably Stemmatoceras. |
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| Keywords: | Ammonites Bajocian Dorset Inferior Oolite Kumatostephanus Stephanoceratids |
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