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The Carboniferous

https://ucmp.berkeley.edu/carboniferous/carboniferous.html

“The Carboniferous Period occurred from about 354 to 290 million years ago during the late Paleozoic Era. The term "Carboniferous" comes from England, in reference to the rich deposits of coal that occur there. These deposits of coal occur throughout northern Europe, Asia, and midwestern and eastern...” (from the page’s text)

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