Abstract
Logan, in 1840, noted the occurrence of pebbles of cannel in the roof of a coal-bed in South Wales; also of pebbles of coal in the ‘Pennant’ rock (Proc. Geol. Soc., vol. iii, p. 276). De la Beche refers to coal pebbles in the Monmouth and Glamorganshire Coalfield, and H. K. Jordan to similar forms of coal in the base of the Pennant Series, and to a coal pebble the size of a hen's egg in the roof of the ‘Rock Fawr’ coal-seam near Bridgend (Q.J.G.S., vol. xxxiii, p. 932). In the roof of the ‘Nanaimo’ coal, in Vancouver Island, a coal pebble in a conglomerate was recorded in 1906. Several instances of water-worn lumps of coal have been mentional in the volumes of the second Geological Survey of Pennsylvania as having been found in the semi-bituminous and Pittsburg regions.
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