陕北地区中侏罗世延安期古地理特征*
王东东1, 邵龙义1, 李智学2, 李兆彬1

Palaeogeographic characteristics of the Middle Jurassic Yan'an Age in northern Shaanxi Province
Wang Dongdong1, Shao Longyi1, Li Zhixue2, Li Zhaobin1
陕北地区延安期层序Ⅱ古地理图