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crinoids - stems


Gen. et sp. indet.

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Ordovician or Silurian erratic boulder from Poland. Sorry for poor quality photos - I'm not able to get better for now. Is this a chance association or can you spot fragments of calyx, stem, and cross sections through arms? What crinoids are these - crotalocrinitids?

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It's almost impossible to determine what fragments are embedded in the eroded matrix, not saying that it's impossible to determine the genus / species of the crinoid remains. I can see pluricolumnals in naturally polished longitudinal / oblique sections, and columnals in transverse view. Also there is a possibility for crinoid holdfast (anchoring system). I'm not seeing arms or calyces, but I could be wrong.

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