A systematic account of the ammonite faunas of the Obtusum Zone (Sinemurian Stage, Lower Jurassic) from Marston Magna, Somerset, UK

M. Edmunds, J. Whicher, P. Langham, and R. B. Chandler

2016

Article

Proceedings of the Geologists' Association 127:146-171

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Taxonomy:

• Ammonitida belongs to Ammonoidea - Edmunds et al. (2016)
• Ammonitina belongs to Ammonitida - Edmunds et al. (2016)
• Psilocerataceae belongs to Ammonitina - Edmunds et al. (2016)
• Schlotheimiidae belongs to Psilocerataceae - Edmunds et al. (2016)
• Angulaticeras belongs to Schlotheimiidae - Edmunds et al. (2016)