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By: Anderson, M. M. - Boucot, Arthur James - Johnson, J GType: ArticleIn: Bulletin of the British Museum (Natural History) GeologyVolume: 18Series:Issue:Date: 1969Page Range: 105--163Publication Info: London, BM(NH),Subjects:
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By: Bergström, Stig M., - Boucot, Arthur JamesType: ArticleIn: Bulletin of the British Museum (Natural History) GeologyVolume: 43Series:Issue:Date: 1988Page Range: 273--284Publication Info: London, BM(NH),Subjects: