A scolecodont (polychaete jaw) fauna from the latest Tremadoc and Arenig strata of the Cow Head Group includes some of the earliest representatives of these fossils in the world. No biostratigraphically useful changes seem to occur within the interval, although rapid diversification follows their appearance in the latest Tremadoc. Insufficient data were recovered to permit conclusions regarding ecological control of assemblages in early Paleozoic, down-slope environments.

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