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The Middle Jurassic stephanoceratid ammonite Kumatostephanus from Dorset and Somerset, UK, and its evolution

, : The Middle Jurassic stephanoceratid ammonite Kumatostephanus from Dorset and Somerset, UK, and its evolution. Geobios

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.


DOI: 10.1016/j.geobios.2013.01.005

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