High Quality Content by WIKIPEDIA articles! A U–Pb zircon age from the fossiliferous rock in Namibia and Oman provides an age for the Namacalathus zone in the range from 549 to 542 Ma, which corresponds to the Late Ediacaran. These organism and Cloudina are the oldest known evidence in the fossil record of the emergence of calcified skeletal formation in metazoans, a prominent feature in animals appearing later in the Early Cambrian. There are only four occurrences of Namacalathus (Namibia, Canada, Oman, Siberia) known to date, all of which are found in association with Cloudina fossils.

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