Fossil Groups - Corals - Generalized Classification

Groups that include stony corals are in bold face type. The names of the most important fossil group are CAPITALIZED. Polyp groups without skeletons are italicized.

Taxonomic Category	Geologic Range

Class Hydrozoa	Vendian¹ to Holocene
Class Scyphozoa	Vendian to Holocene
Class Anthozoa	Vendian to Holocene
Subclass Octocorallia	Vendian to Holocene
Subclass Zoantharia	Cambrian to Holocene
Group 1
Order Tabulaconida	Lower Cambrian
Order Cothoniida	Middle Cambrian
Order TABULATA	Lower Ordovician to Upper Permian
Order Heliolitida	Middle Ordovician to Middle Devonian
Order RUGOSA	Middle Ordovician to Upper Permian
Order Heterocorallia	Upper Devonian to Middle Carboniferous
Order Zoanthidia	Holocene
Group 2
Order Kilbuchophyllida	Middle Ordovician
Order Numidiaphyllida	Middle Permian
Order SCLERACTINIA	Middle Triassic to Holocene
Order Corallimorpharia	Holocene
Order Actiniaria	Holocene
¹ Latest Precambrian period.

Table 1 Generalized Classification of the Phylum Cnidaria With Known Geologic Ranges

Table 1
Generalized Classification of the Phylum Cnidaria
With Known Geologic Ranges