IRMNG name details
original description
Edmunds, M.; Whicher, J.; Langham, P.; Chandler, R. (2016). A systematic account of the ammonite faunas of the Obtusum Zone (Sinemurian Stage, Lower Jurassic) from Marston Magna, Somerset, UK. <em>Proceedings of the Geologists' Association.</em> 127(2): 146-171., available online at https://www.researchgate.net/publication/295396475 [details]
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