Ancient Coral Reefs - Natural History Notebook (Canada) fossil coral section. Rugose Coral - Photographs of Zaphrentis sp. and Canania cylindrica which are commonly found on beaches among the pebbles. Jurassic Coral - Photograph of a chunk of fossilised Isastraea sp. found on the beach in Scotland. Silurian Corals - Photographs of Favosites gothlandicus, Halysites and Tryplasma sp. from Wenlock Edge, England. CarboniferousCorals (Phylum Cnidaria) - Information on rugose and tabulate coral fossils found in Carboniferous limestone with photographs of Amplexus coralloides, Syringopora and Dibunophylum bipartitium. Silurian Reefs - Much of the limestone of the Silurian era was laid down in large reef systems. This article discusses the structure of the reef and the diverse species that lived among the coral.