l"SY4.:i 



291 



[Stetenson. 



"Counties to the extreme Rortherii exposure of the Pittsburg coal, we ob- 

 tain a beautiful series of sections fully illustrating the wedge- shape, of 

 nearly every stratum between coals VIII and X. In this series Coal IX 

 does not appear, as it thins out eastwardly and does not reach the line of 

 section. It is present, however, in the sections, taken four miles west 

 from this line. The localities of the sections are as follows : 



1. C, O. R, R. 3, Crossing of Little Short Creek by Wheeling Plank 

 Road. 3. Near Mt. Pleasant. 4, Between Short Creek and Smithfield, 

 5. Between Smithfield and Little Mclutyre Creek. 6. Near Smithfield 

 ■Station on P. C. & St. L. R. R. 7, Near Knoxville. Of these, the tirst 

 two are in Belmont County, the rest m Jefferson County. 



The Knoxville section, by Mr. H. Newton, is of further interest in that 

 it shows Coal X[ to be only 78 feet above X, whereas, in Belmont County 

 this interval is from 95 to 105 feet. This series shows that the interval 

 between VIII and X, which at the railroad is almost 200 feet, is reduced 

 to only 30 feet at Knoxville, and that the reduction is comparatively 

 gradual, the distance being say thirty miles. 



Passing into Pennsylvania I select four sections^ from a mass which 

 are ecxually illustrative, and arrange them, beginning with the most 

 western and going, eastward. I take only those showing the relations of 

 the Pittsburg to the Redstone and Sewickly, as the sections containing 

 the higher coals are for the most part imperfect in the lower portion. 



1. Interval Rocks 



2. Sewickly Coal 

 S. Interval Rocks 



4. Redstone Coal 



5. Interval Rocks 



6. Pittsburg Coal 



These seem to show a diminution in the thickness of the intervening 

 rocks toward the east. In connection with the fourth section it may be 



• * In the Sections, a dash signifies that the exposure is such as not to admit of aocu- 

 tate measurement. 



t Geology of Penn., Vol. II, pp. 830, 625, 661, and 651. 



