COAL MEASURES. 9 



Measure strata without meeting more than one well defined seam 

 of coal, and it seems quite probable that some of the beds reported 

 as black slate may also represent the horizon of thin beds of coal, 

 the material being so mixed with the slate as to prevent identifica- 

 tion. 



Since the publication of volume 6, of these Reports, a shaft has 

 been sunk at Sandoval, reaching a thick bed of coal at the depth 

 of t02 feet. The following is a copy of the record of this shaft : 



Ft. In. 



No. 1. Surface deposits, clay, gravel, etc 127 8 



No. 2. Shale and sandstone 78 



No. 3. Blue shale 16 



No. 4. Limestone (Shoal creek bed; 10 



No. 5. Black shale 3 6 



No. 6. Coal 2 



No. 7. Fire-clay 4 6 



No. 8. Sandstone and shale 67 6 



No. 9. Blackshale 2 



No. 10. Limestone 6 



No. 11. Fireclay 5 



No. 12. Sandstone and shale 109 



No. 13. Coal 1 2 



No. 14. Fire-clay 2 



No. 15. Sandy conglomerate 5 



No. 16. Sandstone and shale 88 8 



No. 17. Fireclay 2 



No. 18. Pebbly clay 4 



No. 19. Clay shale 11 



No. 20. Blue slate 1 8 



No.21. Coal 10 



No. 22. Fireclay 10 



No.23. Nodular blue shale 10 6 



No. 24. Gray limestone 2 8 



No. 25. Blue shale 2 



No. 26. Gray limestone 2 6 



No.27. Blue shale 3 



No.28. Darkshale 12 



No.29. Coal 6 6 



Total depth 609 



At Breese, twenty-two miles west of Sandoval, the coal was found 

 at the depth of 397^ feet, but no detailed record of the beds passed 

 through was kept. The coal ranges from seven to eight feet in 

 thickness, and has a clay parting an inch or two thick, about two 

 feet from the bottom. A bed of light gray limestone, ten feet in 

 thickness, was passed through some twenty-five to thirty feet above 

 the coal. The roof consists of bituminous shale, containing Discina 

 nitida and the spines and dermal plates of fishes. The coal is con- 

 siderably impregnated with the bi-sulphuret of iron, and is gener- 



