The western two ranges of the Canadian Rockies are mostly underlain by Proterozoic through Paleozoic limestones and shales.

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This statement is true. The western two ranges of the Canadian Rockies, the Front Ranges and the Main Ranges, are primarily composed of sedimentary rock formations dating back to the Proterozoic and Paleozoic eras. These formations include limestones and shales, as well as sandstones, conglomerates, and other types of sedimentary rocks.

The Western Two Ranges of the Canadian Rockies Are Mostly