Abstract: Abstract: It has been contentious whether the late Carboniferous rocks, especially the late late Carboniferous rocks were deposited in the central part of northern Qiangtang of Tibet mainly because of the lack of irrefutable biological fossils. An important progress was made by the 1:250000 geological survey, through which the Walongshan Formation was established. The six recognized fusulinid zones show that the Walongshan formation ranges from the late early Carboniferous through the late late Carboniferous. However, in the survey work, the Montiparus zone located between Protriticites and Triticites was blanked. To exactly reflect the fusulinid aspects, another section closely north to the Walongshan defined section was measured and sampled. Abundant Montiparus and Triticites are newly discovered. These findings inform to us that the unquestioned late late Carboniferous rocks were deposited in the central part of the northern Qiangtang, Tibet.