摘要
将陕西焦坪延安组所产的孢粉化石，分为７３个属、７５个种，其中１个新属、１个新种。根据所产孢粉化石的组合面貌及其主要分子的地质分布，把延安组的时代确定为中侏罗世．
Sporoppllen fossils from Yan'an formation in Jiaoping,Shaanxi province,are studied.Thecollection consists of 75 species from 73 genera,one of the extra of which is a new specie while theother a new genera。According to the characteristics of the sporopollen assemblages as well as theknown geological ranges of their main components, the formation may be refered to the Middle Juras-sic in age.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
1995年第5期477-482,共6页
Journal of Northwest University（Natural Science Edition）
关键词
孢粉组合
延安组
陕西
孢粉化石
sporopllen assemblage
Yan'an formation
Jiaoping Shaanxi
