. First[-fourth] annual report of the Geological survey of Texas, 1889[-1892] Edwin T. Dumble, state geologist. of Carbondale. Thence throughStephens County, passing Crystal Falls, Coal Mountain, the mouth of SandyCreek, and up Sandy Creek to Cisco, in Eastland County, where a few milesto the south the seam passes under the Cretaceous strata. It appears againon Pecan Bayou, near Byrds Store, in the northwestern corner of BrownCounty; thence crossing into Coleman County, on the Wofford survey; andfrom thence crossing Home Creek, on the Scurlock survey, and to the mouthof Bull Creek, on the Colo
. First[-fourth] annual report of the Geological survey of Texas, 1889[-1892] Edwin T. Dumble, state geologist. of Carbondale. Thence throughStephens County, passing Crystal Falls, Coal Mountain, the mouth of SandyCreek, and up Sandy Creek to Cisco, in Eastland County, where a few milesto the south the seam passes under the Cretaceous strata. It appears againon Pecan Bayou, near Byrds Store, in the northwestern corner of BrownCounty; thence crossing into Coleman County, on the Wofford survey; andfrom thence crossing Home Creek, on the Scurlock survey, and to the mouthof Bull Creek, on the Colorado River; and passing Waldrip, in McCullochCounty, where a few miles to the southwestward it passes below the higherpart of the strata. This gives about one hundred and ninety miles of outcrop on a direct line forthis seam. It can safely be calculated that for a distance of ten miles to thenorthwestward of the line of outcrop this coal seam may be made would give an area of nineteen hundred miles under which a workablebed of coal may be found at a convenient depth for economical 5 coal. 437 The outcrop of Coal Seam No. 1 is first seen on the north, near the townof Bridgeport, in Wise County, and passes thence through the western edgeof Parker County, between Millsap and Mineral Wells, and through PaloPinto County, passing G-ordon, and into Erath County, passing Thurber, to apoint about ten miles south of Strawn, where it passes beneath the newerstrata and does not appear again anywhere to the southward. This gives aline of outcrop about eighty miles long; and if the same calculation is madeas in the case of the other seam it would give an area of eight hundredsquare miles of available coal lands of this seam, making the whole area ofavailable coal lands in this part of the State twenty-seven hundred squaremiles. AMOUNT OF COAL IN A GIVEN AEEA. The usual mining estimate of the productive capacity of a coal seam onefoot thick is about one million tons
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