Siphonodella crenulata - P₁, S₂ and S_3-4 elements.

Siphonodella crenulata Cooper, 1939 P₁ elements from the late Tournaisian marly intercalations in shales of the Radlin beds of the Ostrówka quarry in the Holy Cross Mountains.

Diagnoza

Porównanie

Typical S. crenulata specimens occur in sample Ost-4 in Ostrówka, together with the Scaliognathus anchoralis fauna. Most probably they are reworked although the elements in Ostrówka are very well preserved and relatively numerous. In both these aspects they differ strongly from other undoubtedly reworked Famennian and early Toumaisian species in the samples. This may have resulted from a difference in matrix of reworked rocks - perhaps S. crenulata occurred originally in unconsolidated clays of the Alum Shale type, while older Siphonodella species come from eroded limestones.

The holotype of the species comes from the same stratum as the type specimen of S. isosticha,that is from the pre-Welden shale of Oklahoma. These are an extremely small juvenile (S. isosticha) and an extremely mature P₁ element (S. crenulata).

Autekologia

Występowanie geograficzne

Zasięg czasowy

Materiały muzealne

Literatura

Dzik, J. 1997. Emergence and succession of Carboniferous conodont and ammonoid communities in the Polish part of the Variscan sea. Acta Palaeontologica Polonica 42, 57-170.