陕西宁强梅树村阶瓶状微化石的发现及其意义
Discovery of Meishucunian vase-shaped microfossils in ningqiang , Shaanxi and its significances
陕南大巴山西段梅树村阶小壳化石组合特征
The assemblage feature of the small-shelled fossils in MEISHUCUN stage , west segment of the Daba mountains , south Shaanxi