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通过对黑龙江省嘉荫县东南永安村东的黑龙江南岸永安村组和太平林场组界线剖面的研究 ,发现两组界线之下是永安村组顶部的灰色厚层状粉砂质泥岩 ,界线之上整合覆盖着太平林场组的黑灰色页岩 ,页岩以产俞氏链叶肢介 H alysestheria yui(Chang)为特征。全国地层委员会 2 0 0 2年指定嫩江阶的层型剖面为黑龙江省肇州县光荣乡郑德福屯的 2 5号钻孔剖面 ,以青岗链叶肢介 H alysestheria qinggangensis Zhang & Chen的首现作为嫩江阶底界的生物标志。古生物学研究表明 ,青岗链叶肢介 H.qinggangensis是俞氏链叶肢介 H.yui的同物异名 ,俞氏链叶肢介 H.yui的首现便是嫩江阶底界的生物标志 ,因此建议将该阶的界线层型剖面由钻井岩心剖面改为嘉荫县永安村东的永安村组和太平林场组界线的地表露头剖面。该层型剖面沿黑龙江边呈陡坎出露 ,界线清楚 ,交通方便 ,化石丰富 ,易于参观和研究对比。
Based on the study on the boundary profiles of Yong’an Village and Taiping Forest Group on the south bank of Yong’an Village, southeast of Jiayin County, Heilongjiang Province, it is found that there is gray thick bedded silty mudstone on the top of Yong’an Village Formation below the boundary between the two groups. Integration of the dark gray shale that covers the Taipingsuchang Formation, Shale is characterized by the production of Yu’s chain extremity H alysestheria yui (Chang). The stratigraphic profile of the Nenjiang River designated by the National Stratigraphy Commission in 2002 was the 25th borehole profile of Zhengdefurton, Gwangryong Township, Zhaozhou County, Heilongjiang Province. Taking the first occurrence of H alysestheria qinggangensis Zhang & Chen as the reference, Biomarkers of the bottom boundary of Nenjiang. Paleontological studies have shown that the Qinggang chain leaf H. H. longangensis is the same name synonymous with Yuyin chain H.uui limbs, Yu’s chain extremity H. yui’s first manifestation is the bottom of Nenjiang biological It is proposed that the boundary stratotype profile of this stratum should be changed from the drilling core profile to the surface profile of Yong’an Village and Taiping Forest Group boundary of East Wing Village, Jiayin County. The stratum profile is exposed along the steep ridge of Heilongjiang River, with clear boundaries, convenient transportation, rich fossils, easy to visit and research comparison.