They occur in Early Sinian Beiyixi Formation, Late Sinian Zhamoketi Formation and Shuiquan Formation as well as Early Cambrian Xishanbulake Formation respectively.

• 它们分别产出于早震旦世的贝义西组、晚震旦世的扎摩克提组和水泉组以及早寒武世的西山布拉克组。