According to the sporo\|pollen assemblages, the time of the sedimentary tuffaceous bed is Early Jurassic, belonging to second member of the Huxishan Formation.

• 孢粉组合能反映沉积凝灰质岩层段沉积的地质年代；据此确认沉积凝灰质岩层段为下侏罗统湖西山组二段.