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大兴安岭中部伊尔施一带属内蒙古自治区科右前旗阿尔山镇管辖。1959年,宁奇生等人在报道大兴安岭区域地层时,建立了鹿沟组,时代确定为志留纪—早泥盆世。1976年,黑龙江区测二队在苏呼河车站北山“鹿沟组”中首次发现了古杯化石,认为古杯化石层是泥盆系下统鹿沟组的夹层,把古杯化石当做早泥盆世的第一个化石组合,并认为所属层位是泥盆系下统最低层位,重新厘定了“鹿沟组”的涵义,时代为早泥盆世,置于志留系上统古尔班河组之上、泥盆系下统西古兰河组之下。
Daxinganling Central Yiershi a Inner Mongolia Autonomous Region is right before the flag Aershan town jurisdiction. In 1959, Ning Qisheng and others reported the Daxinganling stratigraphy, the establishment of the Lu group, the age identified as Silurian - Early Devonian. In 1976, the Second Test Team of Heilongjiang District discovered the ancient cup fossils in the “Lugou Formation” of the Sulu River Station and believed that the ancient cup fossil layer is the interlayer of the Devonian Deergou Formation in the Devonian. The first fossil assemblage of the Devonian, and that the subordinate layer is the lowest member of the Devonian system, redefined the meaning of “Lugou Formation.” The era was Early Devonian and was placed in the Silurian system On the Gurban River Formation, the Lower Devonian under the Qur’anhe Formation.