Przegl¹d Geologiczny,
48, 226-235 (2000) Dzik, J.,Sulej, T., Kaim, A. & Niedwiedzki, R. Abstract. A new Paleorhinus fauna has been
discovered in a grey claystone corresponding to the subsurface Drawno beds
exposed in a cement plant claypit at Krasiejów near Opole in southern Poland.
The fossils assemblage of very well preserved skeletons and isolated skulls
and bones is dominated with labirynthodonts Metoposaurus diagnosticus,
the phytosaur Paleorhinus sp. being the second in number. Species
undeterminable etosaurs are represented by scuta and fragmentary bones. One
sacral bones most probably representing an early dinosaur related to Staurikosaurus
or Chindesaurus and two incomplete maxilla with teeth showing serration
parallel to the cusp have been found. Rare dipnoans Ceratodus,
undetermined fish scales and teeth, numerous unionid bivalves, very abundant
characean gyrogonites, and ostracods are also represented. The Krasiejów Paleorhinus
species is relatively short-snouted and may represent an earlier stage in the
evolution of the lineage than the populations from Blasensandstein in
Franconia and other known Paleorhinus faunas. This is consistent with
the presence of Metoposaurus diagnosticus, the species originally
described from the Schilfsandstein, located much below the Blasensandstein. An
equivalent of Schilfsandstein is known in boreholes drilled nearby the
locality and the fossil horizon is about 80 m above its top, and about 20 m
above the last occurrence of gypsum in the section. Lehrberg Schichten in
Germany seem thus to be its lateral equivalents, both presumably representing
the final event in the Middle to Late Carnian eustatic cycle. The Paleorhinus
fauna was apparently persistent in the area, as an incomplete skeleton has
been found about 8 m below the most fossiliferous horizon, in a calcareous
intercalation within red clays comparable with the German Rote Wand. |