lamellibranchiate
1. lamellibranchiate dentition
瓣鳃牙系
2. The Shiqianfeng Formation is subdivided into three members, namely, Pingdingshan sandstone, Lamellibranchiate marl and gypsum lime-nodule.
石千峰组又分为三段:平顶山砂岩段、瓣鳃泥灰岩段及石膏钙核段。