近十几年来 ,随着同位素地质年代学的发展 ,伊通火山群地区新生代地层断代问题的研究取得了突破性的进展 ,对重新厘定过去东北泛称下更新统“白土山组”地层的年代找到了突破口。通过火山岩年龄的测定、火山岩与“白土山组”接触关系及孢粉组合的研究 ,确认伊通火山岩群地区的“白土山组”的地质时代为新近纪中新世 ,与松辽平原中心的“白土山组”时代不同。 In recent ten years, with the development of isotopic geochronology, breakthroughs have been made in the study of the generation of the Cenozoic strata in the Yitong volcanic group. It is of great significance to re-define the age of the Lower Pleistocene “Bituoshan Group” Found a breakthrough. Based on the volcanic age, the contact relationship between volcanic rocks and the “Cetushan Formation” and the combination of sporopollen assemblages, it was confirmed that the geological age of the “Cthushan Formation” in the Yitong volcanic group is Neogene in the Neogene, Mountain Group "different times.