| 1. | Coal balls have been found that were smaller than a thimble.
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| 2. | In coal seams, coal balls are completely surrounded by coal.
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| 3. | Coal balls usually do not preserve the leaves of plants.
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| 4. | Coal balls were formed in turned into stone instead.
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| 5. | Coal balls may be found in coal seams across North America and Eurasia.
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| 6. | In 1962, Sergius Mamay and Ellis Yochelson analysed North American coal balls.
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| 7. | European coal balls are generally from the early end of the Westphalian Stage.
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| 8. | This embeds the cells preserved in the coal ball into the cellulose acetate.
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| 9. | Nitric acid, and then acetone, are applied to the coal ball.
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| 10. | Up to 50 peels can be extracted from of coal ball with this method.
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