The Pacific mountains of the United States, as defined by Powell, occupy a belt between the Pacific ocean and that region of lower relief which, lying west of the Rocky mountains, comprises the Basin ranges on the south and the Columbia plateau on the north. Had the discussion presented by Powell been extended to the physiographic features of the whole of the North American continent, it would doubtless have been recognized that the Pacific mountains are continued toward the south into Lower California and toward the north, northwest, and west through British Columbia, the mainland of Alaska, and the Aleutian islands. The colligation of the features of high physiographic relief throughout this belt under the designation of the Pacific Mountain system is here proposed at the suggestion of Mr Alfred H. Brooks.

Throughout its extent, the Pacific system has a general parallelism with the Rocky Mountain system, but . . .

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