Rocky Mountain protaxis and the post-Cretaceous mountain-making along its course

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Abstract
THE Rocky Mountain Protaxis, or SUlIlmit Archrean rangewhich includes the Front Range of Oolorado and Montana, and is continued in British America to the parallel of 52io, and beyond this in some isolated areas-was described, in my Toronto paper,* as having an eastward bend in Montana and Wyoming through more than 250 miles of latitude.It was stated that owing to this eastward shove of the grand line of heights, the United States have a Rocky Sumrnit area of great breadth west of the prot axis, and that this summit area of the protaxis is continued into British America east of the axis.The latter was proved to be the true continuation of the former by references (1) to its having, in the main, the same rocks in the same succession to the top of the Oretaceous, as is shown on a colored geological map by the course of the western outline of the green-colored Oretaceous areas, and (2) by the evidence that both areas participated alike, and together, in the Rocky-summit upturning closing the Oretaceous period, this being sustained by the observations of the Oanadian geologists.It was further remarked that, aligned with the Oanadian or northern part of the Archrean protaxis, there was, to the south, its interrupted continuation, 10,000 to 12,000 feet high, for a hundred miles along the Wasatch Mountains; and that this range, which King showed to be near the eastern limit of the Great Basin, was the true western limit of the "Rocky Summit" region.
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Authors J. D. Dana
Journal american journal of science
Year 1890
DOI
10.2475/ajs.s3-40.237.181
URL
https://doi.org/10.2475/ajs.s3-40.237.181
Keywords Keywords not found

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