NEW DELHI, INDIA—Archaeologists suspect they have found a city spread over five acres in the central state of Chhattisharh. Pottery, coins, seals, and terracotta figurines have been recovered from four mounds, along with evidence of reservoirs and roads. The styles of the pottery and the coins suggest that the city dates from the fifth to third centuries B.C. “We’ve just given them permission for this dig, and I think it will be some time before we understand how important this is, said Arun Raj of the Archaeological Survey of India.