Latest Famennian brachiopods from Kowala, Holy Cross Mountains, Poland. The remains of Late Devonian placoderms from the Holy Cross Mountains area have already been established and widely recognized thanks to the diligent studies of Gorizdro-Kulczycka ([16]) and Kulczycki ([22]) and more recently by Ivanov and Ginter ([19]) and Szrek ([37], and references therein). It is also noteworthy that the I Gorgonichthys i from Kowala described herein and the I Dunkleosteus i from Plucki (Szrek and Wilk, [38]) are the only large marine predators ever found in the Devonian of the Holy Cross Mountains. Water column anoxia, enhanced productivity and concomitant changes in 13C and 34S across the Frasnian-Famennian boundary (Kowala - Holy Cross Mountains/Poland). [Extracted from the article]