EN
The author reports the results of geological examinations of rock raw materials used for the construction of early medieval objects of sacral architecture in Lubin near Gostyn (Poland) as well as in Roman objects in Lower Mesia (Novae, Nicopolis ad Istrum, Belenie, Oeskus, Jastrus Krivina — Bulgaria). The identification of the kinds of rock raw material used, the finding of their aboriginal exploitation places is of importance to understand the scope of the problems connected with the economy of the civilisation at that time. He argues also about the need of complex research on economical history of societies. He points at the interdependence of the facts deriving from various disciplines and consequently on the integrity of the common knowledge of historical process.