Abstract
A late Tertiary succession of plateau basalts, ash layers, and plant-bearing sedimentary beds in south-central British Columbia is described. The rocks are distinguished from an underlying Eocene succession on the basis of lithologic, structural, and geomorphic characters. The distribution of plant microfossils at five separate localities is presented, and an attempt is made to reconstruct the climate and general physiography of the region. From three potassium-argon dates combined with general floral correlation to plant-bearing deposits in Oregon and central Washington, the conclusion is reached that the later succession in British Columbia is late Miocene or early Pliocene.
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