50 (JKOLOGICAL SURVEY OF ALABAMA. 



This coal was analyzed by Dr. J. M. Pickel, of the Uni- 

 versity of Alabama, with the following result: 



ANALYSIS OF COAL HAYNES SEAM. 



Moisture 1.27 



Volatile combustible matter 36.49 



Fixed carbon 56.19 



Ash . 6.05 



100.00 



Coke 62.24 



Sulphur 3.87 



Above the Guide Seam No. 20 the strata are generally 

 clay slate and thin sandstone; in some places wholly clay 

 slate; in others, mainly hard slate and sandstone for fifty to 

 sixty feet, to seam 21. 



The Armstrong Seam, No. 21, of the General Section, was 

 first opened on Armstrong's Creek, in S. 17, T. 13, E. 2 E., 

 by W. B. Armstrong, about sixty feet above seam 20. The 

 cap-rock over this seam is very massive, but not in all places 

 solid rock, Generally it is a rock that weathers into a rough 

 scaly mass, giving it the appearance of compacted shale. 

 In other places the rock is solid and smooth in its lower 

 portion, and only scaly and scragly in its upper parts, yet 

 always presenting a type, or idiosyncrasy of structure that 

 could be very readily recognized, and the seam traced with- 

 out difficulty. It extends throughout the upper half of the 

 Blackburn Fork basin, and is found in the Locust Fork 

 basin, and probably extends through the divide between 

 them. Towards the western end of the Blackburn Fork 

 basin, this seam either becomes small and insignificant or is 

 divided into two seams. Near the western side of S. 20, T. 

 13, R. 2 E., the characteristic cap-rock of this seam is found 

 about 40 feet above Seam No. No, 20, with a thin six inch 

 seam of poor coal beneath it. This is at least 20 feet below 



