702 



GEOLOGY OP OHIO. 



No. 1. middle layer, Hayden's coal. 



No. 2, middle layer, Brooks' coal. 



No. 3, New Straitsville, lower part of upper layer. 



No. 4, Youghiogheny, Pa., coal. 



No. 5. Briar HU), Youngstown, Ohio. 



The composition of the ash of two specimens of the Great Vein coal 

 has been determined by Prof. Wormley, which is shown in the following 

 table with that of one specimen of the Youghiogheny coal : 



Silicic acid 



Iron sesquioxide . . 



Alumina 



Lime 



Magnesia 



Potash and soda.. 

 Phosphoric acid . . 



Sulphuric acid 



Sulphur combined 

 Ch) orine 



Total 



58.75 

 2.09 



35,30 

 1.20 

 0.68 

 1.08 

 0.13 

 0,24 

 0.41 

 .Trace. 



99.88 



55.10 



13.33 



27.10 



1.85 



0.27 



1.00 



0.41 



0.58 



0.22 



Trace. 



98.86 



49.10 

 3.68 

 38.60 

 4.53 

 0.16 

 1.10 

 2.23 

 0.07 

 0.14 

 Trace. 



99.61 



No. 1, New Straitsville coal, lower part of upper layer. 

 No. 2. New Straitsville coal, upper part of upper layer. 

 No. 3, Youghiogheny, Pa., coal. 



It will be noticed that the amount of sulphur remaining in the ash is 

 somewhat larger in the Straitsville specimens; while the phosphoric 

 acid is in one about one-twentieth and in the other about one-fifth that 

 of the Youghiogheny coal. The amount of iron in specimen No. 2 is 

 somewhat remarkable, amounting to 13J per cent, of the ash and 1.06 

 per cent, of the coal. 



The change in chemical composition of the coal from that at Shawnee 

 and Straitsville is very slight ; and this would everywhere be regarded 

 as among the best of bituminous coals. 



The levels carried to different outcrops of this coal by Messrs Jennings 

 and Riley, Civil Engineers, enable us to determine approximately the 

 direction and rate of the dip of the Great Vein ; 



1. From Section 1, Green township, to Section 8, Trimble township (Ewing), distance 

 11 miles, the dip is east 302 feet ; dip per mile, 27.45 feet. 



2. From McCuueville to Ewing, 14 miles, the dip to the south-east is 330 feet ; dip 

 per mile, 23 57 feet. 



3. From Old Straitsville to Ewing, 12 miles, the dip is south-east 305 feet; dip per 

 mile, 25.42 feet. 



4. From Carbon Hill to Ewing, 8.75 miles, the dip is 219 feet ; dip per mile, 28.03 feei. 



