西准噶尔塔克台高原周围一套碎屑岩地层曾被划为下石炭统和布克河组(洪古勒楞组的晚出异名),但其岩性组合、沉积环境与化石面貌均与和布克河组或洪古勒楞组的定义不符,也难以归纳到区域上其他已知地层单元中,故以此建立一个新的岩石地层单位:塔克台组,并分为上、下2段:下段为火山碎屑岩夹火山岩,上段为正常碎屑岩、火山碎屑岩、钙质碎屑岩夹少量灰岩、火山岩和薄煤层.该组与下伏文洛克统沙尔布尔组呈角度不整合接触,上未见顶,多门类动植物化石的发现限定了该组的时代为晚泥盆世,形成于水体逐渐变浅的滨、浅海至沼泽环境.塔克台组与邻区同期的朱鲁木特组、洪古勒楞组为同时异相关系,晚泥盆世研究区海水从西向东侵入并退出是造成这种同时异相关系的主要原因. A set of clastic rock formations around the Taketai Plateau in West Junggar was once classified as the Lower Carboniferous and the Bukhe Formation (late adulterated by the Honggulelung Formation), but its lithological assemblage, sedimentary environment and fossil appearance It is not consistent with the definition of the Hebuke Formation or Honggulechuan Formation and can not be easily integrated into other known stratigraphic units in the area. Therefore, a new lithostratigraphic unit, the Tactai Formation, The next two sections: the lower section of volcanic clastic rock volcanic rocks, the upper section of the normal clastic rocks, volcaniclastic rocks, calcareous clastic rocks with a small amount of limestone, volcanic rock and thin coal seam.This group and the following Wenlock Xuanlv Boolean group formed an angle of unconformity contact and did not reach the top, and the discovery of many species of animal and plant fossils limited the age of this group to Late Devonian, formed in shallow waterfront and shallow sea to swamp environment. In the same period with the neighboring areas, the Zhulugatu and Hongguleluo formations are heterogeneous at the same time. In the Late Devonian, the intrusion and exit of the seawater from west to east are the main causes of this simultaneous heterogeneous relationship.