In this address I should like to try to do three things: first, discuss certain aspects of general principle in the determination and interpretation of orogenic dates; second, review some of the critical evidence on the matter that has been found in the transition zone between the Colorado Plateaus and the Great Basin in Utah; and third, offer a few remarks on the basic nature of the time scale on which we plot these and other events of earth history.
Before attacking the subject matter proper, let me draw attention to a question that undoubtedly hovers in some minds: of...
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