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Recent finds such as the world's largest fossil forest in the [[Illinois]] Herrin coal bed, a 6-foot-thick strip mined by a subsidiary of Peabody Coal, would seem to cast doubt on this theory, as two other actively mined Illinois coal seams, the Danville and the Springfield, which sit above and below the Herrin, respectively, appear to be separated by about a half-million years of geological time. <ref>http://www.stltoday.com/stltoday/news/stories.nsf/sciencemedicine/story/6E9003B041B59699862572C7000F4E02?OpenDocument</ref>
Recent finds such as the world's largest fossil forest in the [[Illinois]] Herrin coal bed, a 6-foot-thick strip mined by a subsidiary of Peabody Coal, would seem to cast doubt on this theory, as two other actively mined Illinois coal seams, the Danville and the Springfield, which sit above and below the Herrin, respectively, appear to be separated by about a half-million years of geological time. <ref>http://www.stltoday.com/stltoday/news/stories.nsf/sciencemedicine/story/6E9003B041B59699862572C7000F4E02?OpenDocument</ref>
The [[mining]] of coal as a [[fuel]] sparked the [[Industrial Revolution]], as coal was used to power [[factory|factories]] and [[railroad]]s, first through the generation of steam, and later when coal became one of several methods of generating [[electricity]].
Four types of coal are anthracite, bituminous coal, sub-bituminous coal, and lignite. Anthracite is the cleanest burning and is found in such regions as south [[Wales]] and northeast [[Pennsylvania]]. Bituminous coal is widely found in [[Appalachia]] and widely used, and does not burn as cleanly as anthracite. Sub-bituminous coal is of a lower grade than bituminous and a higher grade than lignite, and is widely mined in the Powder River Basin region of [[Wyoming]]. Lignite is also known as "brown coal" and is the dirtiest burning, and is mainly used in power generation. The top two locations for lignite mining are [[Germany]] and [[Russia]].
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