The Transcontinental Arch represents portions of the Canadian Shield not covered by seas in the Sauk transgression.

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The Transcontinental Arch is a geological feature that runs from the Canadian Shield in a southwest direction through the United States. During the Sauk transgression, which occurred approximately 600 million years ago, much of North America was covered by shallow seas. However, portions of the Canadian Shield were not submerged, and these areas form the Transcontinental Arch.

The Transcontinental Arch Represents Portions of the Canadian Shield Not