One is a bimodal volcanic assemblage, which formed during the rifting stage of the continental breakup theother is represented by flysch rocks, formed when the passive margin becomes stable.

• 被动陆缘的沉积建造由两套沉积物组成，一套是大陆解体的裂谷阶段所形成的陆相沉积物和双模式火山岩组合，另一套是稳定陆缘的复理石组合；