内蒙古中新统通古尔组孢粉组合及其气候

通古尔组因盛产哺乳动物化石而闻名于世,其中的孢粉化石却很少有人问津,主要出于其岩性不利于孢粉处理之缘故。我所研究生周晓丹曾在1987年去通古尔采样,带回部分孢粉样品,经笔者分析后,发现了一定数量的孢粉。地层概况样品采自二连浩特市东南约80km 处的准乌古尔狼帐房剖面和都古月剖面。这里仅

SPORO-POLLEN ASSEMBLAGE FROM THE MIOCENE TONGGUER FORMATION OF INNER MONGOLIA AND ITS CLIMATE

Tongguer Formation,one of the most famous Neogene fossiliferous strata in China,is well developed in Tongguer(Tung Gur)district located in the southeast part of Erlien,Inner Mongolia.Sporo-pollen assemblage obtained is characterized by the dominent content of Qu- ercoidites,Chenopodipollis,Artemisiaepollenites,and by the moderate amount of Salixipol- lenites,Cyrillaceaepollenites,Tricolpopollenites,along with a few of Betulaceoipollenites,Ulmo- ideipites,Labitricolpites,Rutaceoipollis,Graminidites,Pinuspollenites,Abietineaepollenites,Ep- hedripites and Polypodiisporites etc..A comparison is made between the present assemblage and that from Shangdou-Huade Basin,Inner Mongolia,and the climatic variation tendency re- vealed by these assemblages is contrast with that from the oxygen isotopic records of the DSDP boreholes.The geological age of Tongguer Formation is then assigned to the middle Miocene- late Miocene boundary or the earliest late Miocene,which is a slight later than the result from the vertebrate fossils.