On microstructures of columnaIs of some Paleozoic crinoids
Edward Głuchowski
Scanning electron microscope was used to study columnals of crinoids of Pisocrinus(?) costatus (Shevchenko), Schyschcatocrinus sp., Cyclocaudiculus gracilis Gluchowski, Rhysocamax cristata Moore et Jeffords and Platycrinites minorGluchowski from Silurian, Devonian and Carboniferous deposits of Poland. The presence of microstructures, Interpreted as stereom α and stereom β have been confirmed and the occurrence of what is known as "large" microstructures on the lateral surface of the columnals of Schyschcatocrinus sp. have been stated. Three types within the "large" microstructures have been distinguished, the first of them marked by a close spacing of round, oval or elongated pores, the second with round, less closely spaced pores and the third - having irregular, labyrinthic furrows and depressions.
Key words: crinoids, microstructures, Paleozoic.
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