New bryozoans from the Middle-Upper Devonian (Eifelian-Frasnian) and the Lower Carboniferous (Tournaisian) of the Holy Cross Mountains in central Poland are described: Bigeyella sparsa gen. et sp. nov., B. separata gen. ...
Radiolarian productivity pulses and related radiolarite deposition are phenomena difficult to understand from an exclusively actualistic viewpoint. Evolutionary selection pressure among silica-secreting marine plankton, ...
The prime causation of the mid-Late Devonian mass extinction near the Frasnian-Famennian (F-F) boundary remains uncertain. Nevertheless, geochemical evidence has been presented recently as decisive evidence of a giant ...