Disk-shaped marine echinoderms with calcareous
skeletons that form branching stems and columns. They are
commonly known as sea lilies, even though they are animals
and not plants. They have an age range of Ordovician to the
present but are much more common in the fossil record than
in the present. Crinoids formed rose garden-like communities
in Paleozoic shallow seas and form a common fossil in
many shallow water limestones. The fossils typically are dismembered,
forming “life-saver” or “cheerio-like” rings, or
small stem fragments. The branching, flower-like tops are
rarely preserved.
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