. First[-fourth] annual report of the Geological survey of Texas, 1889[-1892] Edwin T. Dumble, state geologist. rincipally, however, their vegetable origin is well pre-served, and can be easily traced in the woody structure of the different varie-ties, which very frequently contain the stems, leaves, and branches of treesand plants in a good state of preservation. The coals form compact, brittlemasses, with conchoidal fracture, or they exhibit an earthy or woody tex-ture, and, according to their appearance and qualities, they are distinguishedas pitch coal, fibrous coal, woody coal, paper coal
. First[-fourth] annual report of the Geological survey of Texas, 1889[-1892] Edwin T. Dumble, state geologist. rincipally, however, their vegetable origin is well pre-served, and can be easily traced in the woody structure of the different varie-ties, which very frequently contain the stems, leaves, and branches of treesand plants in a good state of preservation. The coals form compact, brittlemasses, with conchoidal fracture, or they exhibit an earthy or woody tex-ture, and, according to their appearance and qualities, they are distinguishedas pitch coal, fibrous coal, woody coal, paper coal, wax coal, and commonbrown coal. Their existeDce has exerted a marvelous influence upon the in-dustry and prosperity of European countries. They belong to the class ofmineral fuels, and, with iron, are the most useful minerals found on our globe,upon the development of which modern civilization is based. In Europe, as well as on this continent, in Texas, the lithological materialwhich composes the beds containing the brown coal deposits consists mainlyof loose sands, various colored clays, and Profile der Oligocaenformation in der Gegend von Halle a. d Saale nach Laspeyres. Credner Elemente d. G-eologie, p. 641. Germany. G. Aelteres Gebirge Porphyry. 1. Kapselthon Clay. 2. Knollensteine Shingle. 3. Unterfloetz Lignite. 4. Stubenoder Quarzsand • Sand. 5. Oberfloetz Lignite. 6. Magdeburger sand Sand. 7. Septarienthon Clay. 8. Glimmersand Sand with mica. D. Diluvium • • .Diluvium. COMPARISON OF LIGNITES. The economic value of lignites can only be estimated correctly from acomparison of the analyses of Texas brown coal with coals worked advan-tageously for many years in Europe. Their analyses must therefore be ofthe highest interest. FUELS AND THEIE UTILIZATION. 55 ANALYSES OF TEXAS LIGNITES. Rockdale, Milam County, analysis by J. H. County, analysis by J. H. , analysis by J. H. Herndon . ...Eagle Pass, analysis by J. H. Ea
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