Acta Musei Moraviae

Basal Balinka Conglomerates in the southern part of the Boskovice Basin between Moravský Krumlov and Veverská Bítýška: correlation lithostratigraphic horizon?

Upper Carboniferous Balinka conglomerates were deposited along the western limb of the Boskovice Basin (eastern part of the Bohemian Massif). They may be locally developed as breccias along its base, tran sitioning into predominant conglomerates and passing gradually into the overlying medium- to fine-grained clastic sediments of the Rosice-Oslavany Formation. These poorly sorted conglomerates gradually pass upward into sandstones with intercalations conglomerates (upper part of Balinka conglomerates). The basal part of the Balinka conglomerate sequence rests directly on crystalline basement rocks (Bíteš orthogneiss). It contains clastic material with local provenance from Moldanubian and Moravian units in close vicinity of studied profiles (gneisses, granulites, serpentines, orthogneisses, quartzites, and marbles). Their thickness varies from a few meters to 80 m. Clasts of greywackes can be interpreted as material of eastern provenance (probably mixed with material from Rokytná conglomerates). The composition of the clastic material and the size and shape of the clasts document an essential role of both water and debris flows typical for alluvial fans.