The Sukhaya Mechetka Middle Paleolithic site which was excavated over a wide area (around 650 m2) is one of few Eastern European sites where 3D fixation of every find was done. The study is focused on estimation of cultural layer preservation in the excavation 1. This yielded possibility to define zones of different production activities within homogeneous horizons. The analysis of archaeostratigraphy demonstrated homogeneity of the most parts of cultural horizon. While its thickness usually varies from 5 to 35 cm in few cases it reaches 105 cm. It is suggested that most areas with disturbed cultural horizons are associated with a shift of control point or related near the ravine zone. This article presents preliminary results, research will continue. The archaeostratigraphy analysis for excavation 2, refitting data analysis, field documentation from the personal archive of S.N. Zamyatnin, quantitative and qualitative analysis of the composition of finds within different zones of the site will allow a more detailed understanding the problem posed.