The book Coal was written by author James Henry Ronaldson Here you can read free online of Coal book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Coal a good or bad book?
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The following thicknesses of the coal- measures above the glacial conglomerate have been observed here and at other parts of the country : Witbank-Middelburg, Maximum 450 ft. Brakpan, East Rand Springs, East Rand East of Springs, on Wilge River Viljoen's Drift, Vaal River, Orange Free State Komati Poort, Lebombo belt Swaziland, Lebombo belt average 200 ft. 130 208 500 446 3, 200 4, 000 A marked feature of Coal-Measures of the Middelburg district, AFRICA 73 and to a certain degree of the whole T...ransvaal, is the rapid variation in the thickness and character of all the constituent beds, particularly the lower beds, a condition due to the strong currents, which laid down the generally coarse-grained sedi- ments. It can, however, scarcely be doubted that intermittent periods of quiescence occurred to admit either of the growth in situ or of the drifting of vegetable matter to a thickness which, in the case of the 20 ft. " Main Seam, " may have amounted to 250 ft. Though the coal-seams share to a considerable extent in the variability of the measures, the assumption of long periods of quiet and stability and a partial, if not entire, "growth in situ " origin, is supported by the per- sistence of a 12-inch seam of bright coal over a distance of 6 miles, and of an 1 8-inch layer of gas-coal at the base of the " Main Seam " over a still greater distance.
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