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The Quarterly journal of the Geological Society of London . Section cf iJie She win fJir Siwcfsxivc Chmigc it Juis Tnvmtenl t'f attriirti TftttpU Bxcvr BlotilCTS Littiog Pl Illustration biodiversitylibrary org Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London