Crinoid Stem Segments Fossil Set STL

A set of six fossil crinoid stem sections. Three have a five-pointed, star-shaped cross-section (two long and one short), and three are round: a small plain stack and two larger ones with finely fluted edges. Each is built from stacked disc-like plates called columnals, with a small central canal running through. Crinoids, or sea lilies, are echinoderms related to starfish. Their stems broke apart after death, and their columnals are among the most common fossils, filling whole limestone beds f…

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