What is the evidence that the interior of North America experienced major subsidence during the Cretaceous?

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During the Cretaceous period, the evidence for major subsidence in the interior of North America is primarily indicated by the widespread invasion of sea water across much of the continent, leading to the formation of marine sedimentary rocks. This geological phenomenon demonstrates that large areas of the continent were below sea level, allowing marine conditions to prevail and deposit marine sediments.

What Is the Evidence That the Interior of North America