Plate II.—Geographical distribution of the coal deposits of the world, and relative reserves. By F. F. Grout.
In Europe the principal coal deposits occur in the Carboniferous system, either in the upper or the lower part. The Lower Carboniferous is the principal series in which coals occur in Scotland, whereas the most important coals in England and in Wales lie in Upper Carboniferous rocks. In northern France, in Belgium, and in Westphalia, Germany, the middle Carboniferous measures contain the most important reserves. Mesozoic coals are found in northern Australia and in central France. The lignites or brown coals of middle Europe are locally very important in Germany; those of Austria are found in numerous small but thick deposits of the Tertiary age.
Fig. 3.—Coal output of the chief coal-producing countries, 1880-1916.
The principal coal resources of Africa are in the southern part of the continent and are chiefly in deposits whose ages range from Carboniferous to Triassic.
In Asia the coal fields are not well defined. There are coal basins of note in India and China. In China important coals are found in the Upper Carboniferous. Coals of the Lower Carboniferous are found east of the Urals and also in Turkestan. In Japan the Mesozoic coals are important. Tertiary coals are widely distributed in Asia but are not high-grade nor of importance.
It may be safely stated that geological reconnoissance has covered the world so well that further development is not likely to disclose coal resources of great magnitude not now known with more or less exactitude. Estimates of resources of some regions will undoubtedly be revised many times, especially those of reserves in the middle portion of Africa, in South America, and China.
COAL PRODUCTION OF THE WORLD IN 1913
As the great World War began on July 31, 1914, the last normal production figures were for 1913. The following [table] of the world’s production of coal for the years 1911-1914 is from “Mineral Resources” of the U. S. Geological Survey, the compilation being credited by Mr. Lesher, of the Survey, to Mr. Wm. G. Gray, statistician of the American Iron and Steel Institute, and Prof. G. A. Roush, editor of “Mineral Industry.”