Five sec tions from the Kielce Re gion of the Holy Cross Moun tains and one core from a bore hole drilled in the nearby west ern Me so zoic Mar gin re veal the best rec og nized de pos its from the De vo nian/Car bon if er ous bound ary in ter val. In four sec tions: Ruda Strawczyñska, Bolechowice IG 1, Zarêby IG 2 and Kowala, the De vo nian/Car bon if er ous bound ary is lo cated within a con tin u ous se ries of deep-wa ter car bon ates, whereas in the two re main ing: Ostrówka Quarry and the Jab³onna IG 1 borehole, the De vo nian/Car bon if er ous bound ary in ter val con tains strati graphic gaps re sult ing from lack of de po si tion in sub marine con di tions. The biostratigraphic po si tion of the analysed up per most De vo nian and low er most Car bon if er ous suc ces sion is de ter mined by as sem blages of cono donts, micro spores and deep-wa ter ostracodes of the Thuringian eco type. A dis tinctive suc ces sion of con tem po ra ne ous fauna as sem blages and lithofacies types is trace able from Holy Cross Mts. to Rhenish Mas sif. The main ex tinc tion oc curred dur ing a trans gres sion-pro moted an oxia, which then re verted in glacigenic re gres sion. The anoxic con di tions are well-ex pressed at Bolechowice and Kowala suc ces sions.

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