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在吉林省通化地区三源浦陆相盆地三棵榆树剖面中,张普林等(1983)在原上侏罗统亨通山组发现了早白垩世固阳鱼群的重要分子昆都仑鱼(Kuntulunia),从而将亨通山组定为下白垩统。这一变动引起了国内有关学者的重视。1985年中国科学院古脊椎动物与古人类研究所、中国科学院南东古生物研究所和吉林省地矿局区调所古生物室联合组队对三棵榆树剖面进行了考查,大家一致认为该剖面地层连续,层存清楚,后期构造影响较小。化石门类较齐全、数量丰富,是我国陆相侏罗——白垩系界线研究的重要剖面。1986年8月
In the section of the three elm trees in the Luyuan basin of the Sanyuanpu area in Tonghua area, Jilin Province, Zhang et al. (1983) discovered Kuntulunia, an important member of the Early Cretaceous Guyang fish group, in the Hengtoushan Formation of the Upper Jurassic, Thereby defining the Hengtongshan Formation as Lower Cretaceous. This change aroused the attention of domestic scholars. 1985 Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Institute of Paleontology, Chinese Academy of Sciences Institute of East China Institute of Geology and Mineral Resources and the Geological Department of Paleozoic team jointly conducted a survey of the three elm trees section, we agreed that the continuous section of the profile , Layers are clear, the impact of late structure smaller. Complete fossil categories, a large number of rich, is China’s continental Jurassic - Cretaceous boundary research important profile. August 1986