地质断代 meaning in Chinese

geologic dating

Both " unit stratotype " and " boundary stratotype " can be carried out equally , but it is better firstly to set up " boundary stratotype " if 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” 。
Terrestrial strata are especially developed in china and the studies are urgent to be deepened , but stratotypes established now by studies on marine strata can not be applied to terrestrial strata
目前以海相地层研究建立的层型尚不能应用于陆相地层，况且一些地质断代还未建立层型。