Orogenic belts in China are characterized by large scale, various forms, widespreading and, mainly, intracontinental positions, which quite different from the European and American pericontinental orogens. There is certain scale tectonic—sedimentary mélange aggregation in each orogenic belt in China. For study of those knotty strata composed by mélange aggregation, it was a common approach using the fossils yielded in the exotic blocks to date whole strata including the matrix strata by same working principle and method as those used in stable areas or carbonate platforms. And then were inferred the relationship in age with strata joined spatially with it and dating to formation of orogenic belt. So the age of formation and evolution about many orogenic belts is ever disputed by different understandings, the key point causing those disparities is that the age of the mélange strata is not determined. This is a universal problem for study on orogenic strata in China. One typical example of division in age is the Naij Tal Groupcomplex in the Eastern Kunlun orogenic belt, the age of which was once assigned by the fossils found in the exotic blocks to the Late Ordovician or the Early Paleozoic. The Naij Tal Groupscomplex is a suit of inhomogeneous metamorphosed strata located between the Nanshan Pass and the East—West Datan regions along the Qinghai—Xizang(Tibet) Highway near Golmud City of Qinghai Province. It is composed of metamorphosed sandstone, slate, phyllite, crystalline carbonate rock, intermediate—basic metamorphosed volcanic rock, intermediate—acidic metamorphosed volcanic rock, schist (partly) and migmatite, with total thickness about 8000m. This groupcomplex is of a great thickness and is chiefly made of grayish—green epizonal sandstone and slate of flysch facies, but only with less limestone and marble. By way of detailed survey and measure, four unusual contact relationships between limestone and marble and sandstone and slate have been found by authors. In this time, 44 genera and species Miocene sporopollen have been firstly found by authors in samples from the matrix strata in this groupcomplex and the Miocene Chenopodipollis—Persicarioipollis—Magnastriatites assemblage is named. This paper is designed to provide some detail evidence for determining the age of the matrix strata in this groupcomplex based upon study at the Cement Factory Section, which would be of great geological significance for further understanding this groupcomplex as a suit of tectonic—sedimentary mélange aggregation. The new finding will certainly benefit from now on the investigation of formation and evolution mechanism for the Eastern Kunlun orogenic belt.