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Fearnhead, Fiona E. and Donovan, S.K. (2007) A robust crinoid from the Llandovery (Lower Silurian) of Norbury, Shropshire: systematics, palaeoecology and taphonomy. Proceedings of the Geologists' Association 118 (4), 339 - 345. ISSN 0016-7878.