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The Quarterly journal of the Geological Society of London . QaarL Journ Geol Soc Vol XLI PI III Frank Riitley del FoorA lit lv IvmLterr Btos imp FULGURITE ON HORNBLENDE GNEISS BLAN Pl III Illustration biodiversitylibrary org Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society