Coal balls are calcium-rich masses of permineralised life forms, frequently having a round shape. As such, coal balls are not made of coal, despite what the name implies. Coal balls were formed 300 million years ago, in the Carboniferous era. They can preserve organic matter exceptionally well, which renders them useful to scientists, who cut and peel the coal balls to research the geological past of the Earth.
In 1855, two English scientists, Joseph Dalton Hooker and Edward William Binney, discovered coal balls in England, and therefore the initial research on coal balls had been carried out in Europe. Coal balls were eventually discovered and identified in North America in 1922. Since then, coal balls have been... See more
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