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The Relation of Concretions to Coal Seams

José Maria Feliciano
The Journal of Geology
Vol. 32, No. 3 (Apr. - May, 1924), pp. 230-239
Stable URL: http://www.jstor.org/stable/30059936
Page Count: 10
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The Relation of Concretions to Coal Seams
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Abstract

Coal balls and roof-nodules are the most important concretions occurring with coal seams. Coal balls have been known for a long time in Europe, but have been only recently discovered in the United States and in Australia. They are formed in situ and contain plant remains which, because of their excellent preservation, yield much valuable paleobotanical information. The shale beds above the coal carry another type of concretion called roof-nodules which are generally formed in situ by the actipn of ground water. The latter also frequently contain plant remains. This article embodies the major conclusions of a more extensive report to be published elsewhere.

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