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n.1.(Paleon.) A genus of trilobites found in the Silurian and Devonian formations. Phacops bufo is one of the most common species.
References in periodicals archive ?
He will discuss Pennsylvania's state fossil, the Trilobite Phacops rana.
Deeper water biofacies constituting the upper portion of the stratigraphic section are dominated by a trilobite-cephalopod-gastropod assemblage primarily defined by Phacops sp.