According to the divide of rocks stratigraphic units stipulated in 'China stratigraphy guide' (2001) and the continuous sedimentary clastic rocks widespread outcrop in Yilehuli mountain area, the five Formations of Niqiuhe Formation (S3-D2n) , Genlihe Formation (D2-3g), Xiaohelihe Formation (D3x), Huadaqi Formation (C1h) and Chargelahe Formation (Cjc) would be consolidated as a group named Liaoyuan Group (S3-C1L). Take Chargelahe area in Heihe city as a typical example, Liaoyuan Group (S3-Q1L) has been divided into the Upper and Lower Liaoyuan Group respectively. The Lower Liaoyuan Group (S3DC1L) includes Niqiuhe Formation and Genlihe Formation, while the other Xiaohelihe Formation, Huadaqi Formation and Chargelahe Formation belong to the Upper Liaoyuan Group (S3-C1Lb). In the process of regulating the lithostratigraphic units, based on the analysis of lateral comparison and division of stratigraphic sequences, it is considered that the Lower Liaoyuan Group consists of marine clastic rocks while the composition of the Upper Liaoyuan Group is continental clastic rocks. The relationship among each Formation in the Liaoyuan Group is conformity. The lower boundary of the Liaoyuan Group is limited on the disappearance of sandstone containing gravel in underlayer Woduhe Formation (S3w), While the upper boundary of which is not integrity. According to fossil record, the period of the Liaoyuan Group is from the Late Silurian to Early Carboniferous.%根据"中国地层指南"(2001)关于岩石地层单位的划分,将出露在伊勒呼里山地区的泥鳅河组(S3-D2n)、根里河组(D2-2g),小河里河组(D3x、花达气组(C1h)和查尔格拉河组(C1ch)的一套海相-陆相连续沉积的碎屑岩并组为群,称燎原群(S—C1L).以黑河市查尔格拉河流域为典型地区,并划分燎原群下亚群(S3—C1La)(包括泥鳅河组和根里河组).燎原群上亚群(S3—C1Lb)(包括小河里河组、花达气组和查尔格拉河组).在黑龙江省岩石地层(清理)中,通过横向对比和纵向层序分析等工作认为,燎原群下亚群以海相碎屑沉积岩为主,而燎原群上亚群则以陆相碎屑沉积岩为主,两者之间为整合接触关系,燎原群底以下伏卧都河组上部含砾砂岩消失为界,而顶部不全,时代为晚志留世晚期至早石炭世.
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