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The Quarterly journal of the Geological Society of London . Quart Joupn Geoi SocA XL Pi ' r'fi'ftfj 'Q 'P ' sIS ' Herscliell ith In' OMl Al CU Jul DM WestNewmsLTL mp Pl Illustration biodiversitylibrary org Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological