The Connaigre Bay Group is a sequence of subaerial volcanic rocks (basait, rhyolite) and interbedded sediments that outcrops in the southwestern part of the Avalon Zone, in central Newfoundland. Although not previously dated, it has been considered to be latest Proterozoic in age, based on lithological correlations with the nearby long Harbour Group, which is conformably overlain by fossiliferous Cambrian rocks. A U-Pb zircon age of 682.8 ± 1.6 Ma is reported here for rhyolite in the lower part of the Connaigre Bay Group. Other dated felsic volcanic rocks in the Avalon Zone of Newfoundland have yielded dates of less than approximately 630 Ma, suggesting that previously held correlations between at least the base of the Connaigre Bay Group and.for example, the long Harbour Group and the Bull Arm Formation need to be re-examined. The age of the Connaigre Bay Group overlaps within error the age of the protolith to a gneiss in the Grey River area. This may support previous suggestions that gneissic rocks that outcrop in varied places on the south-central and southwestern coasts of Newfoundland are part of an Avalonian composite terrane.