摘要
对陕西长武地区Ｙｓ４钻孔含煤地层中的孢子花粉进行了系统研究，并根据孢粉组合特征和地层层序论述了这一含煤地层的时代属中侏罗世早期。运用古地理分区及孢粉所代表的古植物生态类型，提出本区属湿润温带一亚热带气候与地理环境．
Spores and pollen grains from the Yanlan formation in Ys4 drilling well of Changwu,Shaanxi,are studied.Based on the sporopollen assemblage,the Yan'an formation belongs to the EarlyMiddle Jurassic in age,It is suggested that the Yan'an formation sporopollen assemblage exist in thenorth provinces of China in paleophytogeography,indicating a moist subtropic climate condition then。
出处
《西北大学学报（自然科学版）》
CAS
CSCD
1995年第5期487-490,共4页
Journal of Northwest University（Natural Science Edition）
关键词
孢粉植物群
延安组
古气候
侏罗纪
陕西
sporopollen assemblage
Yan'an formation
paleoclimatology
