age assignment

• 时代归属

age assignment的用法和样例：

例句

1. Above all, the former Xileng and Beijiangjun Formations are subdivided and the age of the formations and some problems concerned are also discussed.
   在此基础上对西冷组的层序进行了重新划分，厘定了与周岗组的接触界面性质，讨论了原北将军组的构造属性及可能的时代归属。