In this study archaeological sites are defined as objects comprised of two major components. One of them is regarded as culturological, and the other one — as natural-historical. The first component is mainly represented by the artefacts, and thus it supplies cultural-historical information, examination and interpretation of which is one of the primary tasks of archaeology as a discipline of the humanities. The second component includes eco-facts, nature-facts and so-called cultural-natural objects. All оf them have natural origin or were shaped under a strong influence of the natural environment, which makes it reasonable to deem this second component the basis for natural-scientific repository of archaeology. It provides materials for geological, palaeobotanical, palaeozoological, chemical and other researches. It must be strongly emphasized that such knowledge without a cultural-historical context has no purpose or focus. This article demonstrates that the natural-historical component is an integral part of any archaeological site. It is inseparable from the culturological component. A vivid material embodiment of the link between the two is provided by the cultural layer. Essentially,