Both unit stratotypeand boundary stratotypecan be carried out equally, but it is better firstly to set up boundary stratotypeif a suitable section could be found.
Both unit stratotypeand boundary stratotypecan be carried out equally, but it is better firstly to set up boundary stratotypeif a suitable section could be found.
陆相层型可以“单位层型”与“界线层型”建立并举，有条件的地质断代还是要重视建立“界线层型”。