The geology and mineral products of Missouri . and are some-times buried at great -depths. They are sometimescontinuous over areas of many square miles, andsometimes dwindle from a workable to an insignifi-cant thickness within the same square mile. Thegreatest development of coal beds in the State is overthe marginal area, as is indicated by the distributionof coal mines; here the beds are also nearer the sur-face, which makes them more accessible. In theextreme northwestern counties there is less availablecoal of workable thickness, though we have there thegreatest accumulation of Coal Measu
The geology and mineral products of Missouri . and are some-times buried at great -depths. They are sometimescontinuous over areas of many square miles, andsometimes dwindle from a workable to an insignifi-cant thickness within the same square mile. Thegreatest development of coal beds in the State is overthe marginal area, as is indicated by the distributionof coal mines; here the beds are also nearer the sur-face, which makes them more accessible. In theextreme northwestern counties there is less availablecoal of workable thickness, though we have there thegreatest accumulation of Coal Measure rocks, (athickness of about 2,000 feet). Just what is workable thickness is, of course, avariable term. In Pennsylvania a bed less than threefeet thick was not considered workable, and wouldnot compete with other beds five and more feet Missouri beds as little as eighteen inches thick Coal Production in Missouri. ,1885,1884,18831882, Tons Produced. 3,017,000 2,650,000 2,437,399 2,223,000 4,023,000 .1,800,,750,,500,,250,,000,,750,,144,618. 900,000. 900,000. 900,000. 900,000. 750,000. 714,000. 700,,321,930 . 621,930 .8,302,195 100,000 272,255 8,903 Total 44,936,230 are extensively worked with profit, in fact as muchas one-fourth of the annual production is from bedsnot over two leet thick. The reasons for this are inthe conditions of the trade and in the manner ofoccurrence of the coal. The greatest thickness ofany one coal bed in tlie State maintained over a con-siderable area, is about five feet; that is of a coalbed within the area of what Ave may term the regularCoal ^Measures. Beyond the margin of this forma-tion, however, there are isolated deposits of coal ofmore limited superficial area, but of great verticaldimensions. These are familiarly known as coalpockets. The coal in these pockets sometimes hasthe phenomenal thickness of
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