Answer
Most Cretaceous-age coal in the United States is found in the central and northern regions of the country. Large coal deposits are concentrated in areas that were once part of a vast swampy environment during the Cretaceous period. These areas include parts of the Midwest, Great Plains, and Northern Appalachia regions. Cretaceous-age coal deposits are an essential source of fossil fuel and have been significant contributors to the nation's energy resources.
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