in Nei Monggol Zizhiqu et al. (Eds). Huabei diqu gushengwu tuce. Neimongol fence 2. Zhong, xinsheng dai bufen. [Fossils of North China. Inner Mongolia vol. 2. Mesozoic, Coenozoic section]. [Northeast Inst. Geol. ], Dizhi Chuban She (Geological Press], Bei
