|
|
Silurian Scolekodonts of the Barrandian area
Tonarová, Petra ; Fatka, Oldřich (advisor) ; Slavík, Ladislav (referee) ; Michalík, Jozef (referee)
Scolecodonts (= jaws of the polychaete worms) have always been a relatively neglected group of microfossils. In the Prague Basin (Czech Republic), only two major studies exclusively focused on scolecodonts have been published. The aim of the present research was to fill in this gap - by a restudy of the historical collections of Žebera and Šnajdr, and its comparison with results gained from newly collected late Silurian samples and scolecodont faunas from other areas. It has turned out that the jawed polychaete fauna in the Prague Basin was much more diversified than previously reported. The last report on late Silurian scolecodonts by Šnajdr (1951) concluded that there are four determined and two species left in open nomenclature present. Restudy of the original collection has shown that there are at least 11 different species from families Mochtyellidae, Polychaetaspidae, Ramphoprionidae, Paulinitidae, Atraktoprionidae, Skalenoprionidae and Hadoprionidae. The new collection from similar stratigraphical level gained at least 25 species, including one newly described ("Mochtyella" pragensis). The taxonomic re-study also focused on the species Kettnerites kosoviensis that is a type species of the genus and was described in the Prague Basin. The new samples come from the limestone which is in contrast to...
|
|
| |
|
| |
|
|
Late Silurian Conodont Faunas from Barrandian - selected problems
Carls, P. ; Slavík, Ladislav ; Valenzuela-Ríos, J. I.
Working on biostratigraphy of the late Silurian and of the early Devonian by means of conodont successions from Bohemia and other regions, we realize that the relevant modern literature conveys several problematic opinions and practices of identification and zonation. Silurian/Devonian boundary and adjacent strata, conodonts have been and still are important biostratigraphic tools. However, the more intense the work with them was, the more frequently mischief with their application happened. Many important taxa have been lumped; it affected negatively the precision of stratigraphic correlation. The conodont stratigraphy of late Silurian-early Devonian urgently needs revision.
|
guest ::
