| 1 | Gaolan County Central 18 dry counties in Gansu, one of the Kowloon-drought years is Gaolan features. | |
| 2 | At the same time, a Sm-Nd isochron age of 1180 Ma is obtained. According to the regional stratigraphic correlation, isotopic age and micropaleoplants, we put the Gaolan Group in the Mesoproterozoic. |