IMG_8794 Kedjekorall

Silurian fossil chain coral, Gotland.

 

Halysites (meaning chain coral) is an extinct genus of tabulate coral. Colonies range from less than one to tens of centimeters in diameter, and they fed upon plankton.

These tabulate corals lived from the Ordovician to the Devonian (from 449.5 to 412.3 Ma).(Wikipedia)

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