Lithostrotion

Lithostrotion
Scientific classification
Kingdom:	Animalia
Phylum:	Cnidaria
Class:	Anthozoa
Order:	Rugosa
Family:	Lithostrotionidae
Genus:	Lithostrotion Fleming, 1828

Lithostrotion is a genus of rugose coral which is commonly found as a fossil within Carboniferous Limestone. Lithostrotion is a member of the Lithostrotionidae family. The genus Lithostrotion, a common and readily recognised group of fossils, became extinct by the end of the Palaeozoic era.

Amongst the various species of the Lower Carboniferous coral family Lithostrotionidae recorded in Britain are the following:

...
Wikipedia