Abstract
[Hooper et al. (2002)][1] present stratigraphic, chemical, and field relationships for Tertiary volcanic rocks of eastern Oregon and conclude that (1) the Imnaha Basalt are ∼15.5 m.y. old and (2) the Steens Basalt (ca. 16.6 Ma) represents the earliest eruptions of the Columbia River Basalt flood-
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