A synopsis of Westphalian?earliest Stephanian medullosalean and allied plant fossils from the Central and Western Bohemian basins, Czech Republic

 

Authors: Šimůnek Z, Cleal CJ

Published in: Bulletin of Geosciences, volume 95, issue 4; pages: 441 - 468; Received 22 January 2020; Accepted in revised form 5 June 2020; Online 18 October 2020

Keywords: Medullosan pteridosperms, Pennsylvanian, Radnice Member, Nýřany Member, Westphalian,

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A revised data of the medullosalean foliage remains from the CWBB


 

Abstract

The Medullosales were among the most diverse seed-plant clades in the Pennsylvanian palaeotropical, peat-forming wetlands and their fossil foliage constitutes valuable biostratigraphical and palaeofloristic indices. However, there have been several recent taxonomic revisions of the intramontane floras of the Central and Western Bohemian basins, as well as a number of unpublished records that were not incorporated into previous palaeogeographical studies. In this paper, we collate all of the currently available data on medullosalean foliage from the middle and upper Pennsylvanian Kladno Formation from these basins. The different autochthonous and allochthonous floras of the Radnice Member were coded separately to see if the habitats that represent may have had an effect on the analysis. The new dataset suggests that the roof shale floras, although still distinct from those of the lowland paralic basins, are more comparable to the similar aged intramontane Saar-Lorraine floras than was suggested previously. The apparent palaeofloristic difference between the Central and Western Bohemia and Saar-Lorraine floras seems to have been at least partly because the data for the former area included species from both ash deposits that representing peat substrate vegetation and roof shale floras representing clastic substrate vegetation.