Abstract:Based on previous research and zircon SHRIMP data, the authors suggest that the "Dahalajunshan Formation" should be disintegrated into several different formations. They establish a new formation named the "Laerdun Daban Formation" for the volcanic rocks exposed in the Laerdun Daban in the eastern segment of the West Tianshan, which are thought to be the product of La Te Carboniferous volcanism. The "Dahalajunshan Formation" will still be used for the Early Carboniferous rocks south of Xinyuan City. Volcanicsedimentary The volcanic rocks of the "Dahalajunshan Formation" exposed extensively in the western segment of the West Tianshan Mountains are relatively complex. Thus the name "Dahalajunshan Formation" will continue to be temporari Ly used for the Early Carboniferous rocks in the Dahalajunshan area Volcanicsedimentary south of Tekes where the original naming section of the "Dahalajunshan Formation" is distributed. The volcanic rocks distributed extensively in the northern part (Northern Gold Mine Area ZhaosuTekesiGongliuAxi) formed in the Late Devonian rather than in the Early Carboniferous as PR Evious believed. Therefore the authors suggest that a new name -- the Tekes Daban -- "Formation" be used for this suite of Late Devonian Volcanicsedimentary rocks.