Table 2 Statistical table of the ages of grotto excavations in Gansu Province
Periods | Wei and Jin Dynasties | Northern and Southern Dynasties | Sui and Tang Dynasties | Song Dynasty | Yuan Dynasty | Ming Dynasty | Qing Dynasty | Unknown |
|---|---|---|---|---|---|---|---|---|
Number | 11 | 56 | 32 | 20 | 10 | 56 | 37 | 24 |