| 1 | The city fo Tangshan was rebuilt on the site of the old city. | |
| 2 | The Chinese prehistoric square walled towns firstly emerged in Henan Longshan culture of Central Plains. | |
| 3 | Three years later, a ruined town was found under 300ft of water off the north coast of Turkey in the Black Sea. | |
| 4 | The discovery of the prehistoric townsite of Baodun culture marks the origin of cities in Sichuan. | |
| 5 | We gain an important enlightenment from this archaeological discovery on the research for the age and character of the stone fortress and other related stone buildings. |
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