Possible Clues:

• Dealing with old remains in a mad alcoholic rage
• Studying history through digs
• Relating to study of historic artefacts
• Chief, reasoning correctly, preserves most of vast age. It's all to do with excavation
• In old, old Gallic area rebuilding church could be described thus
• A cool glacier has almost melted, as remains to be studied
• Studying ancient evidence, review oil and charcoal age