. The geography of Texas, physical and political. tems. The lignites contain a higherpercentage of water and a lower percentage of carbon;thej are therefore inferior to the coals as a fuel. TheTexas lignites are confined to the Eocene rock these fuels are not of the highest grade, theyare, nevertheless, exceedingly valuable in a large stateof which many parts are entirely destitute of timber. Carboniferous coal occurs in the eastern part of theCentral basin. Only two of the nine seams known toexist are at present worked, viz., numbers 1 and 7. Theformer varies in thickness from
. The geography of Texas, physical and political. tems. The lignites contain a higherpercentage of water and a lower percentage of carbon;thej are therefore inferior to the coals as a fuel. TheTexas lignites are confined to the Eocene rock these fuels are not of the highest grade, theyare, nevertheless, exceedingly valuable in a large stateof which many parts are entirely destitute of timber. Carboniferous coal occurs in the eastern part of theCentral basin. Only two of the nine seams known toexist are at present worked, viz., numbers 1 and 7. Theformer varies in thickness from fourteen to twenty-eightinches and is extensively mined at Thurber in Erathcounty. Here the Texas and Pacific Coal Companyoperates four collieries and has an output of 400,000 tonsannually. This seam is also mined near Bridgeport inWise county, at Rockcreek in Parker county, and nearStrawn in Palo Pinto county. Seam number 7 is workedat Cisco and somewhat irregularly in the southern part ofColeman county. It was formerly worked near Bowie in 96. Jmg. 7: 97 98 THE (;eo(;raphy of ^fexas Montague county. The distribution of the Carboniferousrocks of the North Texas coal fields is shown on theaccompanying map (Fig. 72). The northern, known asthe Brazos field, is separated from the southern, knownas the Colorado field, by a belt of Cretaceous rocks. Cretaceous coal is mined at Eagle Pass in what has beentermed the Eagle Pass or Nueces coal field, which lies in
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