The Oldest Bryozoans: New Evidence from the Early Ordovician

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Science  19 May 1978:
Vol. 200, Issue 4343, pp. 771-773
DOI: 10.1126/science.200.4343.771


An abundant, previously problematic fossil from the Lower Ordovician (Canadian) Black Rock limestone of the Ozark Uplift area is an undescribed dianulitid bryozoan. It is believed to be the oldest unquestionable bryozoan known. The growth morphology varies widely and is believed to be environmentally influenced.