Reconstructing the past

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Across
  1. 4. A huge stone
  2. 6. The history before written history
  3. 8. The father of history
Down
  1. 1. A hard kind of stone in grey shade
  2. 2. The study of coins
  3. 3. The Chinese who visited India in the 5th century
  4. 5. Study of the remains of things excavated
  5. 7. A royal command given by the king