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The coal deposits of the eastern United States began to form during the Carboniferous Period, approximately 300 to 350 million years ago. During this time, the region was characterized by warm, swampy environments with lush vegetation, primarily consisting of ferns and giant tree-like plants. These conditions facilitated the accumulation of organic material, which, over millions of years of heat and pressure, transformed into coal. The climate was generally humid and tropical, conducive to the growth of extensive coal-forming forests.

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