Mid-Proterozoic Rb-Sr muscovite ages on metasedimentary boulders within the Highland Border Complex, together with Archean TDM ages on the same clasts, provide constraints on terrane movements in the Scottish Caledonides. An origin for these clasts from cratonic North America is ruled out. Combined radiometric age, TDM, and fauna1 province studies on basement materials provide a potentially productive method of determining the provenance of terranes.

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