U–Pb zircon and titanite ages were obtained from three intrusive rocks near the Monashee Highway between the Valhalla complex and the Okanagan Valley in the southern Omineca Belt. Granitoid phases that have been previously grouped together and referred to as the Whatshan batholith have been subdivided on the basis of lithology and U–Pb geochronology into the Middle Jurassic Spruce Grove batholith and the Late Cretaceous Whatshan batholith. A 77 ± 0.5 Ma phase of the Whatshan places a maximum age limit on regional F3 folding in the Pinnacles area.

You do not currently have access to this article.