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The Quarterly journal of the Geological Society of London . QX Jouria Geol Soo Yol XXII PIXI ' iff Mi ' ' JV Williams PI litK IC KsLnhiTt imp C'QALPLAINTTS DT BRITISH AMERICA Pl XI Illustration biodiversitylibrary org Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological