北美西部内陆海盆Niobrara组的钙质超微化石及其环境意义——Ⅰ：钙质超微化石及其分带
刘怀宝，D．K．Watkins
Calcareous Nannofossils from the Niobrara Formation(Upper Cretaceous)and Pareoenvironments of the North American Western Interior Basin Part I：Nannofossil Assemblage Characteristics and Zonation
LIU Huai-bao1，D.K.Watkins2
J4
.
2004, (1): 1
-25
.
