The late Paleozoic bivalves of brackish water and fresh water, often referred to as "non marine facies", were widely distributed in the late Paleozoic due to the widespread development of the special facies environment related to transgression and regression in the vast region. At that time, the periodically submerged coastal plains were forming, and these plains became places of strong sedimentation and coal formation. Under unstable hydrochemical conditions, bivalve animals constitute the main part of the fauna, sometimes even the only group. They can not only inhabit the coastal environment, but also tolerate a considerable degree of desalination. They live in the residual water body inside the mainland or infiltrate into the estuarine area. Therefore, they can be used for the correlation of contemporaneous but different facies (Marine and continental) strata, which is very important for the late Paleozoic section in Siberia. In Western Europe, the late Paleozoic non marine bivalves have been successfully used for regional correlation of coal bearing sediments. The faunal zoning of coal bearing basins in England can be correlated to Belgium, France, and even the Donets Basin. For Siberia and Kazakhstan, the late Paleozoic coal bearing strata are widely developed, and a series of large coal basins have been formed, but similar section zoning has not been carried out. On the one hand, the conditions in this region, especially in remote areas (such as the northwest of the Siberian Platform and the southeast of Kazakhstan) have greater diversity in lithofacies and climate, on the other hand, the study of Late Paleozoic "non marine" bivalves in Siberia and Kazakhstan is not sufficient. Generally, the comparison of coal bearing sedimentary areas in Siberia and Kazakhstan is based on flora, and the degree of bivalves used for this purpose is far from enough. This is not only because the actual materials known so far are limited, but also because of the particularity of this kind of fauna, which makes its research and stratigraphic application extremely difficult. The shell morphology of non marine bivalves is very simple, but it also has great individual variability. The characteristic that fauna is usually preserved in the form of core makes it impossible for us to study its internal structure; The deformation in the burial process makes different forms look similar after death. The great sensitivity of bivalves to lithofacies leads to the existence of assemblages with significant composition differences in the region at the same time. In the case of limited materials, these assemblages may be mistaken for different ages. All these situations sometimes lead to the identification of completely different forms, which may naturally lead to wrong stratigraphic conclusions, even in the same area. At present, there is no doubt about the decisive significance of bivalves for the division and correlation of coal bearing deposits in limited areas (separate exploration blocks and deposits). Especially for the method of detailed stratigraphy using bivalves, the coal bearing sediments in Kuznetsk basin have been studied in detail. In this scale comparison, we use not only (or even mainly) the species composition of the combination, but also the overall appearance of the fauna that constitutes the fauna layer: individual size, the number of characteristic components, the composition of genera, burial types, etc. However, such fauna horizons are limited to a limited area. In regional comparison, the principles for dividing faunal assemblages are different, and one of the most important conditions for comparison is to find out the succession order of faunal assemblages in time and their dependence on spatial distribution and composition changes. To solve this task throughout Siberia, we must first identify these problems in each region. Until recently, the only area considered to have roughly determined the composition and sequence of bivalve assemblages in the entire late Paleozoic section (from the lower Carboniferous to the Triassic) was kuzbas. For other regions, especially the vast area such as the Siberian Platform, not even a standard profile that can track the succession sequence of fauna assemblages has been known before. The existing materials come from far away areas and different stratigraphic intervals. In view of the characteristics of the above-mentioned brackish water bivalves, it is difficult to identify the stratigraphic sequence of the identified assemblage. At present, the number of producing areas of Late Paleozoic non marine fauna has increased significantly. It is no longer suspected that the late Paleozoic fauna previously thought to exist in kuzbast is widely distributed in East Kazakhstan, Siberian Platform, taimer Peninsula and bochaola basin. This situation makes it possible to use bivalves for regional comparison. Unfortunately, in most cases, different authors have different ways to compare profiles based on bivalve molluscs, and they are inconsistent with the indicative significance of flora and other fauna groups. This is not only because of the above reasons, but also because the basis of comparison often depends on the emergence of a single species, and the correctness of the identification of the species often depends on the preservation status, and its duration may be affected by a series of factors (including the integrity of collection) in each specific case. In order to find out the possibility and way of using non marine bivalve molluscs to compare the late Paleozoic sedimentary regions in Siberia, the author carried out field work in almost all the sites where kuzbbas type non marine bivalves were reported (see Figure 1), and repeated acquisition was carried out from some standard sections in Kuznetsk basin. The author has mastered a large number of practical materials, which are not only collected from field investigation, but also provided by people from all walks of life and friendly organizations for identification. The total number of specimens is about 5000. This includes materials from the following sections: 1. Carboniferous clay shale (bassnyder formation) near Tomsk city. The specimens were collected by the staff of the Geological Bureau of western Siberia. After description and identification, they have been sent to the Museum of the Geological Bureau of western Siberia in novkuznetsk for preservation. 2. sediments of the balahong group (C ₁=P ₁) and the prode group (P ɑ) in the tuoyang river profile opposite the village of kuzbaschalijam and in the tuoyang river profile downstream of the village of mjayu. 3. core materials from the boreholes in the whole kuzbbas area (the specific location is given in the description). 4. deposits of the coal free formation and the beloleqin formation of the izih deposit in the minusinsk basin (profile near the ibakan River izih mine). 5. sections of the burguklin formation (P ₁) and pelyatkin formation (P ɑ) in the Siberian Platform (gorbiachin River, Tanka River, Bruce River, fokina River, tasayeva River). 6. kendrake formation (P ₁) of kendrake Syncline in Southeast Kazakhstan. 7. arekayev formation and transition formation in gorlovsk basin. The description does not include most of the specimen collections of the gorlovsk basin, because the particularity of the fauna needs to be elaborated separately; It also does not include the collected products of Kazakhstan's maiqiubin group (bukovi River, karazal mountain), because its fauna contains a large number of marine bivalve groups, which also need to be specially studied. For the same reason, the bivalve assemblages in the sediments that form the bottom of the kendallek formation are not included in the description. The first stage of studying the above materials is to find out the unique combination and its spatial and temporal distribution in each specific region. For this reason, in order to describe the combination most completely, all materials are quoted in this paper, even the forms that cannot be accurately identified. The next stage of the work is to compare the sediments in the study area. To accomplish this task, a number of methodological issues need to be addressed and all existing materials on these areas need to be revised. For this reason, the author consulted the collection of bivalve specimens preserved in the Central Geological Museum of the all Soviet Institute of Geology and other museums in Leningrad and Moscow, as well as the materials described in the works of Bo I cherneshev, ye m liutkovich, O V lobanova, I a spaskaya and en V Ivanova. In addition, the staff of the wolkuta Geological Bureau kindly provided a small batch of bivalve specimens from the bochaola basin for comparison; The staff of Karaganda Geological Bureau provided the specimen collection of Karaganda basin. M. A. plotnikova kindly provided the shell specimens of the genus pruukvelda plotnikov from the Permian sediments of the Russian platform. I would like to express my heartfelt thanks to all the people who sent me the comparison materials. For comparison, we also consulted the specimen collections of V. P. amaritsky on the Russian platform and those of B. I. cherneshev and de. M. Fedotov on the Donets Basin. Through these studies, we can not only find out the vertical sequence of faunal assemblages in the specific sections of kuzbas and Siberian Platform, but also outline some general rules of faunal changes. In addition, it is necessary to revise the previous concepts about the scope of some genera and the composition of the whole genus of the Siberian non marine bivalve group. A series of identifications had to be revised because they were outdated or inaccurate (cherneshev's specimen collection on the minusinsk basin and lyutkovic's specimen collection on temer). The characteristics of the above-mentioned non marine bivalve groups determine that two basic methodological principles need to be applied in the study of them: for stratigraphic division -- to find out the phylogenetic relationships of various groups and the evolution of the most representative genera and associations. For cross-section comparison -- the replacement sequence of the combination in time and its distribution law in space. This problem is mainly solved by compiling Paleobiogeographic maps or charts. Through the research in this direction, the migration path of the most representative non marine bivalve genus was determined. The migration path map and paleogeographic map of several time periods were constructed and used for regional section correlation. Based on the comprehensive analysis of bivalve assemblages, the main stages of the formation of Siberian fauna have been preliminarily determined, so that the scope and boundary of some stratigraphic units can be more accurately defined. At the same time, the possibility of regional correlation using such fauna and zoning of Late Paleozoic coal bearing deposits in Siberia based on bivalves is also clarified. Finally, the book describes 18 genera (4 of which are new genera) and 60 species (40 of which are new species).