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Early Cambrian Archaeocyathid reefs

Cambrocyathus from Cambrian of Nevada. Collected by Matt Nietcki.
Cambrocyathus from Cambrian of Nevada. Collected by Matt Nietcki.
During the Early and Middle Cambrian reef like structures built by Archeaocyathids, a sponge-like animal with a hard calicium carbonate double layered shell can be found in California, Nevada, Labarador, Germany, Siberia, and Australia. By the Late Cambrian the Archeaocyathids go exticnt and stromatolite structures are common (New York).

Photo Gallery

Lower Cambrian Ajax Formation. Australia PE 16041
© The Field Museum - CC BY-NC
Lower Cambrian Lower half of Forteau Formation. Southern Laborador Collected by N. H> Nitecki 1987.
© The Field Museum - CC BY-NC
Lower Cambrian. Archaeocyathid Southern Australia UC 52001
© The Field Museum - CC BY-NC
Cambrocyathus from Cambrian of Nevada. Collected by Matt Nietcki.
© The Field Museum - CC BY-NC