Fossil group

Rugose corals

Corals · Ordovician – Permian

An extinct order of corals — solitary "horn corals" and colonial forms — that secreted a calcite skeleton with prominent radial partitions. They were important Palaeozoic reef- and mound-builders and disappeared in the end-Permian extinction.

A broad fossil group rather than a single taxon — the units below record it among their fauna or flora.