New data on the stratigraphy and structure of the Pre-Kokshaal foredeep (Kyrgyz and Chinese Tianshan), fragments of which have been preserved on the northwestern edge of the Tarim continental massif, now in the Ferghana, Kokshaal and Kharke ridges, are presented. The foredeep emerged when the Turkestan ocean closed and the South Tianshan collisional structure built at the end of the Carboniferous and the beginning of the Permian, about 310 - 290 Ma. The next parts of the Pre-Kokshaal foredeep may be highlighted. 1) The inner zone, which is superimposed on the distal part of the former slope of the Tarim continent and filled with Moscowian – Kasimovian turbidites, then folded and thrusted to the southeast. 2) To the south, outer zone, which corresponds to the proximal part of the slope, where the same events and structures developed here later, in the Gzhelian – Asselian. Analogues of these mostly flysch zones are usually not included as parts of the Pre-Ural, Prealpine and other classic foredeeps, where they are completely captured into the thrust complexes. 3) Marginal zone of the Pre-Kokshaal trough was loaded with thick clastic deposits only in the Gzhelian, but already at the beginning of the Permian its subsidence compensated, and the flysch was covered by Asselian limestones. After the Asselian thrusts in the Ferghana Ridge and less significant deformations in the east, development of the foredeep towards the south apparently stopped under the influence of the Tarim mantle plume, which facilitated the separation of the mantle slab and led to thickening and heating of the Tarim continental crust. After the Hercynian collision completed, in the Late Cenozoic the Pre-Kokshaal Upper Paleozoic foredeep experienced intracontinental transverse compression and surface shortening, when it completely disappeared in the east of the Tien Shan, but supplemented from the south by a new Cenozoic molasse trough.