Grewingkia canadensis - AbsoluteAstronomy.com

Grewingkia canadensis is a species of prehistoric coral

Coral

Corals are marine animals in class Anthozoa of phylum Cnidaria typically living in compact colonies of many identical individual "polyps". The group includes the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton.A coral "head" is a colony of...

, found in North America.

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