Crinoid Stems
Age: Silurian
Formation: Thornloe

Crinoid stems range from the Lower Ordovician through to Recent. They were widespread in North America. They are composed of small discs, usually round, but can be elliptical or five sided. They may be isolated or stacked to form stems. These pieces may be found articulated or scattered. These fossils can form whole limestone formations. Almost all Paleozoic genera of crinoids have been described from parts of the crown, as the stems and and plates are poorly preserved. The photo at left shows the crinoid debris.

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