Stars in the Silurian sky: Echinoderm holdfasts from the Carnic Alps
A small collection of echinoderm holdfasts from the Ludlow Cardiola Formation of the Carnic Alps (Austria) contains a wide range of morphologies as a response of environmental adaptation. In general, the holdfasts have a globous and massive dome-like profile with several processes arranged in a sub-radial disposition, so to create a sort of ‘star-like’ outline. A small central depression is common but not present on all specimens. The distinctive holdfasts are preserved in an iron-rich phase, documenting a substitution that has also affected other non-echinoderm calcareous material.
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Ferretti, A., Ausich, W.I., Corradini, C., Corriga, M.G., Schönlaub, H.P. (2017). Stars in the Silurian sky: Echinoderm holdfasts from the Carnic Alps. Geologica Acta 14http://rosaeproject.org/wp-content/uploads/2016/11/16710-34989-3-PB.pdf