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Line 56: ==Distribution== [[File:Coal ball from southern illinois.JPG\|thumb\|A coal ball from southern Illinois]] Coal balls were first found in [[England]],{{sfn\|Hooker\|Binney\|1855\|p=1}} and later in other parts of the world, including [[Australia]],{{sfn\|Kindle\|1934\|p=757}}{{sfn\|Feliciano\|1924\|p=231}} [[Belgium]], the [[Netherlands]], the former [[Czechoslovakia]], [[Germany]], [[Ukraine]],{{sfn\|Galtier\|1997\|p=54}} [[China]],{{sfn\|Scott\|Rex\|1985\|pp=124–125}} and [[Spain]].{{sfn\|Galtier\|1997\|p=59}} They were also encountered in [[North America]], where they are geographically widespread compared to [[Europe]];{{sfn\|Scott\|Rex\|1985\|p=124}} in the [[United States]], coal balls have been found from [[Kansas]] to the [[Illinois Basin]] to the [[Appalachian region]].{{sfn\|Phillips\|Avcin\|Berggren\|1976\|p=7}}{{sfn\|Andrews\|1951\|p=433}} The oldest coal balls were from the early end of the [[Namurian]] stage (326 to 313 mya) and discovered in Germany and former Czechoslovakia,{{sfn\|Scott\|Rex\|1985\|p=124}} but their ages generally range from the [[Permian]] (299 to 251 mya) to the [[Upper Carboniferous]].{{sfn\|Jones\|Rowe\|1999\|p=206}} Some coal balls from the US vary in age from the later end of the [[Westphalian (stage)\|Westphalian]] (roughly 313 to 304 mya) to the later [[Stephanian (stage)\|Stephanian]] (roughly 304 to 299 mya). European coal balls are generally from the early end of the Westphalian Stage.{{sfn\|Scott\|Rex\|1985\|p=124}}

Coal ball: Difference between revisions