内蒙古苏尼特左旗第三纪地层研究新进展

本文探讨了内蒙古苏尼特左旗地区第三纪地层划分问题，阐明了区调工作中所取得的新进展。利用新发现的哺乳动物化石证明了始新统伊尔丁曼哈组的存在，并将中新统通古尔组细分为三段。运用不整合面、古地磁、孢粉和化学分析资料对必鲁图东南的新第三系进行了分解，从原定的通古尔组中划分出了宝格达乌拉组。对原定的宝格达乌拉组进行了重新认识，将其更名为塔木钦塔拉组，其时代为中更新世晚期。

NEW RESEARCH ADVANCE ON TERTIARY STRATA IN SONID ZUOQI AREA,INNER MONGOLIA

ased on a good deal of practical materials,the authors probe into the division problem of Tertiary strata in Sonid Zuoqi area,and expound the new progress acquired in the geological surveying. Making use of newly discovered mammal fossils, the authors prove that Yierdingmanha Formation do exist in this area,and Tungur Formation can be subdivided into three members.According to unconformity interface,paleomagnetism, sporopollen and chemical analysis,the authors also decompose Neogene strata in southeast Bilutu,demarcate Baogedawula Formation from original Tungur Formation. Original Baogedawula Formation is reviewed here, its name is replaced by Tamuqintala Formation which belongs to late period of Middle Pleistocene.