作者根据在甘肃省宕昌县及岷江一带，进行1：5万区域地质调查研究成果，将该区三叠系自下而上划分为五个组。
On the basis of the results of 1:50000 regional geological surveys , the Triassic distributed in the Minjiang River valley in Yanchang County , Gansu Province , may be divided from below upwards into five formations .
宕昌县