IN THE UPPEB KIO GBANDE EMBAYMENT IN TEXAS. 77 



8. Good coal, slightly weathered 14 



7. Bone coal 3 



6. Fair coal, with some Half inch lenses of fireclay W/, 



5. Clayey bone coal 3 



4. Fire clay, dark and slightly bituminous, with white seams 

 above 48 



3. Bone coal 2 



2. Fair coal, becoming bone coal above 13 



1. Fire clay 2 



4. 



Section of the Eagle Pass Coal in the East Bank of Olmos Cbeek, one Half 

 Mile North from the South Line of Survey 166, Block 7. 



Thickness 

 in inches. 



17. Cap rock, gray shale 



16. Coaly shale 2 



15. Fair coal, weathered 6 



14. Fire clay % 



13. Black fair coal 1 



12. Impure brown coal 6 



11. Bone coal 4 



10. Fair coal, slightly weathered 14){> 



9. Fireclay % 



8. Fair coal 65^ 



7. Fire clay, light above, dark below 40% 



6. Very good coal 3 



5. Fire clay 2 



4. Fair coal, 13 



3. Fire clay 3 



2. Fair coal with some streaks of bony coal 7 



1. Fire clay 2% 



The points where these sections were taken lie in the line of the 

 strike of the coal seam, extending from the northeast to south- 

 west a distance of ten miles. It will be seen that in two respects 

 there is a gradual change in the coal to the northeast. The vein 

 is split up into progressively more and smaller parts. The total 

 thickness of the coal does not perceptibly decrease to the north- 

 east, for there is at Fuentes fifty-six inches, in the lower pit forty- 

 one inches, but again in the upper pit fifty-four inches. Along 

 with the splitting of the vein there is a decrease in the degree of 

 purity of the coal (See plate 2). Irrespective of the weathering of 

 the coal exposed in the upper pit, most of the coal was slightly 

 impure from the presence of original clayey sediments. The 

 significance of these changes is clear. The northern exposures are 



