Special paleontologically based investigations of the stratigraphy of the coal-bearing deposits of the Kuznetsk Basin were first undertaken by the author on behalf of the Geological Institute of the Academy of Sciences of the USSR, and partly on behalf of the Geological Committee, beginning in 1928 and continuing for several years. Subsequently, other researchers naturally joined in the development of this project, and their results concerning the Upper Paleozoic flora of the basin have also been taken into account in the present work. The foundation of this study consists of the paleobotanical observations and collections made by the author during the course of the above-mentioned stratigraphic investigations (in 1928, 1929, 1930, 1931, and 1935) at natural outcrops and mining excavations. The collected specimens are housed in the Geological Sciences Institute of the Academy of Sciences of the USSR (abbreviated in the text and plates as “IGN”) under catalogue numbers 2276, 2340, 2492, 2404, and 2761. A portion of the material examined came from the collections of the F. N. Chernyshev Museum in Leningrad and is designated in the text as “TsGM.” In addition, I used a large number of specimens provided by fellow geological survey workers who had worked in the Kuznetsk Basin, including: I. M. Belyanin (No. 2804), P. N. Vasyukhtsev (No. 2808), K. F. Grasikevich (No. 2802), T. P. Kochetkov (Nos. 2799 and 2761), O. V. Ponova (No. 2809), G. P. Radchenko (No. 2803), A. P. Rotai (Nos. 2799 and 2761), and V. I. Skok (No. 2795). Individual specimens were also supplied by T. S. Bovina, E. N. Yegorov, V. V. Monrilisky, V. A. Orestov, B. M. Serdiyensky, V. I. Chereshev, and others. All of these materials, with the exception of a few specimens, are likewise preserved in the Geological Sciences Institute of the Academy of Sciences of the USSR. I would like to take this opportunity to express my sincerest gratitude to all the colleagues mentioned above, both for providing, at times, unique materials and for sharing their views on stratigraphic succession. Such assistance was especially valuable when dealing with insufficiently studied regions or stratigraphic sections whose floral characteristics had not yet been clearly established. 段落 5 Finally, I must extend special thanks to Professor A. N. Khristoforovich for his valuable comments and suggestions offered during his review of this manuscript. There is no doubt that, even under a charitable assessment, certain omissions and shortcomings will be found in the present work. Such imperfections are unavoidable when dealing with the vast and highly complex body of material represented by the Upper Paleozoic flora of the Kuznetsk Basin. Nevertheless, I am firmly convinced that, in light of all the accumulated evidence, a study of this kind is essential for advancing more detailed stratigraphic investigations of the basin and for promoting the broad application of paleobotanical data in geological exploration. I sincerely hope that the effort invested in this work will yield appropriate benefits. The study of the Upper Paleozoic flora of the Kuznetsk Basin is divided into two parts. The first part is devoted to the description of the Upper Paleozoic flora itself. The second part contains chapters on the stratigraphy of the basin, including a detailed analysis of stratigraphic subdivision schemes, the history of the formation of the basin's coal-bearing deposits, comparative studies between sections containing the Kuznetsk-type Upper Paleozoic flora and the corresponding sections of the Kuznetsk Basin, as well as comparisons between this flora and those of the Gordavai, Kataepis, and Sarjerois stages. The final chapter addresses the nature and age of the Upper Paleozoic floral type represented in the basin. Only the first part of the present work, namely the purely paleontological section, is published here. The second part is nearly equal in length to the first, but owing to publishing difficulties it could not be issued simultaneously. This work was completed in 1940 and summarizes our knowledge of the Upper Paleozoic flora of the basin as of May 1940. In order to avoid further delays in publication, newly accumulated materials obtained by the author after that date were not incorporated. These materials, including new species and new localities, do not fundamentally alter the contents of the present work and may be published separately at a later date, as anticipated in the publication program of Paleontology of the USSR.