Field investigation of stratigraphical distribution of fusulinaceans in the Maokou Formation of Panxian, Guizhou Province has suggested that the Yabeina and Chusenella did not coexist in the same horizon despite the overlapping in stratigraphical ranges.

• 对贵州盘县火铺剖面茅口组?类分布规律的研究显示 ,尽管?类 Yabeina及 Chusenella生存时代相同 ,并可见于同一剖面 ,但两者在具体产出层位上却具有互不共生的特点。