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Cnidarians and the Fossil Record

Although Cnidarians are relatively simple organisms and appeared fairly early in the history of life, fossil evidence for them was only recently found (1940's) in the Flinders Range, southern Australia in rock strata that has been dated at about 650 million years.

Photograph of the fossil coral Heliophyllum taken by Dlloyd. Heliophyllum halli from the Devonian. Locality - Arkona, Ontario, Canada. Complete matrix free specimen which measures 4.3 cm across.