The Pre cam brian base ment and Lower Pa leo zoic (Cam brian-Or do vi cian) sed i men tary cover in the east ern part of the Up per Silesian Block (Brunovistulicum), known only in bore holes, is pre sented, and their palaeogeographic, fa cies and palaeotectonic de vel op ment is dis cussed. The for mer is char ac ter ized by a het er o ge neous struc ture that con sists of Archean-Lower Pro tero zoic and Neoproterozoic rocks of dif fer ent lithologies and or i gins, and the lat ter is al most ex clu sively rep re sented by ma rine, tran si tional and ter res trial siliciclastic rocks. In con trast to the neigh bour ing re gion of the west ern part of the Ma³opolska Block, the siliciclastic sed i men ta tion took place dur ing the Early and Mid dle Cam brian in this area, however, the Or do vi cian de pos its were en coun tered in sev eral bore holes and no Si lu rian rocks have been re ported in the northern part of this re gion. The au thors pres ent the most prob a ble model of sed i men ta tion, tec ton ics and or i gin of the geo log i cal struc ture of the Lower Pa leo zoic sed i men tary cover in the Up per Silesian Block, de fine re search prob lems, and jus tify the need for new drillings. Based on the geo log i cal and struc tural anal y sis of the depth to the top sur face of the Lower Pa leo zoic, they de fine the op ti mal lo ca tion for three 1500 m deep bore holes to solve the ba sic re search prob lems.Key words: Pre cam brian base ment, Lower Pa leo zoic sed i men tary cover, Up per Silesian Block, Brunovistulicum, south ern Po land.

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