多期的 meaning in English

multiphase
polyphase

There existed multiple unconformities owing to multistage structural activities
由于多期的构造活动，该区形成了多期的不整合。
The polyphasic and episodic tectonism of these basins usually had a significant influence on the regional deposition - erosion cycles and the depositional patterns
盆地构造演化的阶段性、旋回性及多期的构造变革对盆内多旋回的沉积剥蚀过程的叠加和原型盆地的叠合等可产生深刻的影响。