coal ball


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coal ball

[′kōl ‚bȯl]
(geology)
A subspherical mass containing mineral matter embedded with plant material, found in coal seams and overlying beds of the late Paleozoic.
References in periodicals archive ?
Coal balls in batter and fry until golden brown Drain on paper towels, then transfer lo large bowl with curry sauce.
Too chef green curry chicken (Serves 4)
Marie Stopes, the discovery of pteridosperms, and the origin of Carboniferous coal balls.
A Macroneuropteris scheuchzeri tree preserved in growth position in the Middle Pennsylvanian Sydney Mines Formation, Nova Scotia, Canada
The first discovery of in situ coal balls in Nova Scotia.
Sir William Dawson (1820-1899): a very modern paleobotanist
By the nature of inherent limited size, coal balls cannot preserve the large parts of the fronds known to be borne by the arborescent alethopterid plant.
The "medullosalean forest" at the Lloyd Cove Seam (Pennsylvanian, Sydney Coalfield, Nova Scotia, Canada)
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