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In 1855, two English scientists, [[Joseph Dalton Hooker]] and [[Edward William Binney]], made the first [[academic publishing|scientific description]] of coal balls in England, and the initial research on coal balls was carried out in Europe. North American coal balls were discovered and identified in 1922. Coal balls have since been found in other countries, leading to the discovery of hundreds of [[species]] and [[genus|genera]].
Coal balls may be found in coal seams across North America and [[Eurasia]]. North American coal balls are more widespread, both [[stratigraphy|stratigraphically]] and geologically, than those in Europe. The oldest known coal balls date from the [[Namurian]] stage of the Carboniferous; they were found in Germany and on the territory of former Czechoslovakia.
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