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User:Bonniedougall/Siphonodendron

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File:Siphonodendron400.jpg

Siphonodendron was a common colonial rugose ("wrinkled") coral of the Carboniferous period. In fossil form it now appears as a white or brownish mass of short spaghetti-like threads, usually more or less flattened during subsequent distortion of the embedding limestone. It is included in the sub-class Hexacorallia – corals with six-fold symmetry.

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