Periods | The number of rectangle, square, or trapezoidal ancient cities | The number of irregular ancient cities | The number of ringlike or circular ancient cities | Uncertain shape |
---|---|---|---|---|
Yangshao period | 0 | 0 | 7 | 11 |
Longshan period | 13 | 0 | 2 | 9 |
Xia and Shang Dynasties | 10 | 2 | 3 | 7 |