By the control of Dahezhen fault and Yunshan fault,at the early rifting stage,mainly deposited radiorian silicolites at the abyssal region eastern Dahezhen deep fault.

• 早期裂谷阶段在大和镇断裂和云山断裂的控制下，在大和镇断裂以东形成了深海环境，主要接受了放射虫硅质岩沉积，其后期的深海环境不断缩小。