ILLUSTRATIONS. 



Plate I. View from Quitman Mountains toward foothills. 

 II. Oil well, Nacogdoches County. 



III. Map of oil region of Nacogdoches County. 



IV. Map of iron ore areas of East Texas. 



V. Thurber Coal Mine. Shaft No. 1, Texas and Pacific Railway. 

 VI. Vertical section of strata, Northwest Texas. 

 VII. Comparative section of strata. 

 VIII. Southwestern part of Young County. 

 IX. Northern part of Stephens County. 

 X. Weatherford and Milsap. 

 XI. Ground plan of a long wall working. 

 XII. Section across the face of a long wall working. 



XIII. Thurber, Erath County. 



XIV. Gordon, Palo Pinto County. 



XV. Vicinity of Crystal Falls, Stephens County. 

 XVI. Vicinity of Cisco, Eastland County. 

 XVI. Sections across Carboniferous and Permian. 

 XVII. Red sandstone quarry, Quito, Texas and Pacific Railway. 

 XVIII. Map of coal districts. 

 XIX. Weathering of Burnetian gneiss, Cat Mountains, Llano County. 

 XX. Exposure of Upper Cambrian shales, Silver Mine Creek. 

 XXI. Map of Central Mineral Region, with transit lines, etc. 

 XXII. Economic map of Central Mineral Region. 



XXIII. Map of the Central Mineral Region. (In pocket.) 



XXIV. Diabolo Mountains, El Paso County. 

 XXV. Lower outlet, Carrizo Canyon. 



XXVI. Sections along lines indicated on topographic map of Trans-Pecos Texas. 

 XXVII. Sections of Cretaceous in El Paso County. 

 XXVIII. Topographic map of Trans-Pecos Texas. (In pocket.) 

 Pig. 1. Profile of Calvert Bluff, Robertson County 53 



2. Profile in the vicinity of Hall's 54 



3. Section showing relations of sands 71 



4. Section at A. Duncan headright 72 



5. Section of Hall's Hill 123 



6. Section two miles southeast of Marshall 127 



7. Section^of Hightower Ridge 133 



8. Section of Allan's Bluff 138 



9. Section at Walnut Creek 150 



10. Section of lignite bed near Port Caddo 156 



11. Section three miles west of Hughes Springs , ... 181 



12. Section two miles east of Daingerfield 181 



13. Diagram showing benches between Pilot Hill and Caddo Bayou 188 



14. Section of Texas Eire Brick and Tile clay pit 195 



15. View from Brewer's Mountain, Nacogdoches County 225 



16. Section four miles southeast of Carthage 235 



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