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pg 006: Reconnaissance in the Rio Grande coal fields of Texas Publication 5040853.

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Descriptive geology-Continued. Page. Tertiary-Continued. Eocene-Continued. Reconnaissance from Carrizo Springs to San Lorenzo Creek 47 Nueces River section 47 Reconnaissance from Uvalde to Carrizo Springs and from Carrizo Springs to Santo Tomas 50 Frio River section 51 Conclusions regarding the Eocene 53 Neocene and Pleistocene 54 Neocene 55 Pleistocene 55 Economic geology 55 Eagle Pass coal field 55 Extent 55 Mines 60 Character of coal 60 Eocene coal fields 61 Extent of the Eocene coal fields, including the Santo Tomas field 61 Mines 64 Character of coal 64 Conclusions regarding the Rio Grande Eocene coals 66 Literature 67 II.-SAN CARLOS COAL FIELD. Introductory note 73 Geographic position of localities studied 73 Literature 74 Topography and structure 74 Sections studied and notes thereon 76 Peak 6 miles west of south from Chispa 76 Sections in the vicinity of San Carlos 77 Vieja Mountains east of San Carlos 77 Fossils from same 78 Detailed section through coal seam 79 Arroyo northeast of shaft of San Carlos Coal Company 80 Fossils from same 80 Overturned fold north of shaft of San Carlos Coal Company 80 Fossils from same 81 Sands and clays 81 San Carlos and arroyo above 81 Gettysburg Peak 81 Résumé of San Carlos section 81 Age of fossils below the coal 82 Bracks Canyon 82 Geographic distribution of quartz-pantellerite 83 Correlation of the Chispa and San Carlos sections 83 Time of the volcanic outbursts 83 Dikes 83 Strata below the San Carlos formation 84 Extent of San Carlos and other Trans-Pecos Texas coal fields and condition of mining 85 Character of San Carlos coal, including analyses 87 Report on igneous rocks, by E.C.E. Lord 88

 

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