New Nd isotope data are presented for plutonic orthogneisses of the Long Range inlier in western Newfoundland. The inlier represents a fragment of Grenvillian basement located within the Appalachian orogenic belt of eastern Canada. The Nd data suggest that the Long Range is divided into two blocks with different crustal formation ages of ca. 1.75 Ga and 1.55 Ga, interpreted as juvenile arc terranes that were accreted to the Laurentian continent during its Proterozoic evolution. The two blocks are correlated with the Paleoproterozoic and Mesoproterozoic terranes of Labradoria and Quebecia previously recognized in the Grenville Province of the mainland. The...