436 GEOLOGY OF NORTHWESTERN TEXAS. 



PART II. 

 ECONOMIC GEOLOGY. 



COAL. 



THE AREA OF WORKABLE COAL. 



The two workable seams of coal, Nos. 1 and 7, have a general course of 

 outcrop from northeast to southwest. Seam No. 7 is in the Cisco division, 

 and lies toward the top of the Coal Measures. Seam No. 1 is in the 

 Strawn division, and lies toward the bottom of the Coal Measures. Each one 

 of these seams has been traced from place to place along the line of outcrop, 

 so that there is not a mile of the line that has not been passed over and had 

 special examination. 



Local sections and maps have been made at various localities to show the 

 exact relation of the Coal Seams to the surrounding strata. Wherever it was 

 possible the names of the surveys upon which the outcrop appeared was 

 given. Lines of triangulation and levels were run with as long lines as pos- 

 sible, in order to get the true dip of the seams at quite a number of places. 

 The maps showing this work are given on plates at different places in the 

 Report. 



The outcrop of Coal Seam No. 7 begins on the north, near the town of 

 Bowie, in Montague County, and runs thence southwest ward through Jack 

 County, crossing the West Fork of the Trinity River near the mouth of 

 Lodge Creek. Thence by the town of Gertrude. Thence through Young 

 County, by Flat Top, the mouth of Coal Creek, Belknap, and crossing the 

 south line of Young County near the town of Carbondale. Thence through 

 Stephens County, passing Crystal Falls, Coal Mountain, the mouth of Sandy 

 Creek, and up Sandy Creek to Cisco, in Eastland County, where a few miles 

 to the south the seam passes under the Cretaceous strata. It appears again 

 on Pecan Bayou, near Byrd's Store, in the northwestern corner of Brown 

 County; thence crossing into Coleman County, on the Wofford survey; and 

 from thence crossing Home Creek, on the Scurlock survey, and to the mouth 

 of Bull Creek, on the Colorado River; and passing Waldrip, in McCulloch 

 County, where a few miles to the southwestward it passes below the higher 

 part of the strata. 



This gives about one hundred and ninety miles of outcrop on a direct line for 

 this seam. It can safely be calculated that for a distance of ten miles to the 

 northwestward of the line of outcrop this coal seam may be made available. 

 This would give an area of nineteen hundred miles under which a workable 

 bed of coal may be found at a convenient depth for economical purposes. 



