The current study features structural characteristics and some other properties of the deposits at the archaeological site Prospikhinskaya Shivera-IV. The aim was to identify the paleontological-geographic peculiarities of formation the Holocene deposits of the geo-archaeological object. Paedogenesis factors and turbations have been revealed as a result of windfall successions and human activity in various historical periods. The basic paedogenic processes have been established, i.e. humus and podsolic formation. A formation of cespitose and podsolic soils have been detected on the surface of the first river-valley terrace as transitional type from cespitose inundated soils to podsolic ones. The article includes some physical and chemical properties of the deposits. The results obtained are necessary for interpretation the paleontological, geological and ecological life conditions of the ancient people in the valley of the Angara River.