of the Ohio Coal-measures. 195 



in the earlier classifications. Their list of names, beginning 

 with the Conglomerate, is as follows : 



1. The Blackwater sandstone, which represented the Potts- 

 ville conglomerate. 



2. The Savage formation, which extended from the top of 

 the Blackwater sandstone or conglomerate to the top of the 

 Davis or Lower Kittanning coal and included nearly the lower 

 half of the Allegheny formation. 



3. The Bayard formation, which extended from the top of 

 the Davis coal to the top of the sandstone overlying the Four- 

 foot or Barton coal. This formation contained the upper half 

 of the Allegheny and the lower part of the Conemaugh forma- 

 tion. 



4. The Fairfax formation, which continued from the top of 

 the Bayard formation to the base of the Elkgarden or Pittsburg 

 coal and contained the remainder of the Conemaugh forma- 

 tion. 



5. The Elkgarden formation, which contained the rocks 

 above the base of the Pittsburg coal, all of which, with perhaps 

 the exception of the highest, were in the Monongahela forma- 

 tion.* 



Upon the organization of the Geological Survey of Ohio by 

 Dr. Newberry a thorough study of the coal deposits of the 

 state was undertaken and to the second report he contributed 

 a " Sketch of the Structure of the Lower Coal Measures in 

 Northeastern Ohio."f Dr. Newberry stated that " North of the 

 National Road we have in Ohio, below the Barren Measures, 

 from six to eight workable seams of coal, forming what is 

 known as the lower coal series.";}; Beginning with the lowest 

 seam, which was called Coal No. 1, they were described and 

 given numbers, the highest one being Coal No. 7,§ which was 

 stated to be " the highest workable seam of coal in Ohio below 



the Pittsburg bed It is overlaid by the great mass of 



colored shales which form the Barren Coal Measures."! 



At a later date all the names proposed by Prof. Rogers for 

 the Coal-measure formations of Pennsylvania were adopted 

 for those of Ohio, as shown by a "Vertical section of the rocks 

 of Ohio " published in 1873,'on which the Coal-measures are 

 composed of the following formations : 



" Upper Coal Measures ) 

 Barren Measures [• 1200 ft."T 



Lower Coal Measures ) 



*Geologic Atlas of the United States; Folio 28, pp. 3, 4, 6 and "Columnar 

 Section." 



fGeol. Surv. Ohio. Report Progress in 1870, 1871, p. 14. 

 t Ibid., p. 26. § Ibid., pp. 26-44. || Ibid., p. 43. 



1[ Rept. Geol. Surv. Ohio, vol. i, pt. i, faciDg p. 89. 



