10 GEOLOGY OF OHIO. 
the great Pottsville Conglomerate of Hastern Pennsylvania that the 
name Conglomerate Group came to be applied to these lower strata. 
Even though fully accepting this identification as a matter of 
geological history, it is still open to the working geologist to discard 
the sub-divisions that have been established upon it, and to count all 
the coal seams, enumerated above, as belonging to one unbroken series. 
In point of fact, there is no more marked separation between the highest 
coal seam of the Conglomerate series and the lowest of the Productive 
Measures than can be found between two coals of the latter sub-division. 
Newberry has always insisted upon counting all of the coal seams 
of Eastern Ohio, from the Sharon coal to the Upper Freeport coal, in- 
clusive, as belonging to the Productive Measures, and Lesley has 
distinctly intimated in recent publications of the Second Pennsylvania 
Survey that he holds a similar view, at least so far as the western part 
of that State is concerned. (See Report on Beaver County, Q, p. 65.) 
In the present report, the view of Newberry will be adopted as the 
most serviceable for the field with which we are dealing, and all of the 
coal seams named in the two general tables already given (Figures I 
and IT), will be considered as included in the Lower Coal Measures. 
This departure from the present Pennsylvania classification consists 
simply in the removal of a line of division which has no natural promi- 
nence in the coal measure rocks of Ohio. 
The composition of the conjoined series is repeated below so far as 
the leading elements are concerned : 
6 24. Upper Freeport Coal. 
23. Upper Freeport Limestone. 
22. Upper Freeport Sandstone. 
21. Lower Freeport Coal. 
20. Lower Freeport. Limestone. 
19. Lower Freeport Sandstone and Shale. 
18. Upper Kittanning Coal. 
17. Lower Kittanning Coal. 
16. Kittanning Clay. 
15. Kittanning Sandstone. 
14. Ferriferous Limestone and Buhrstone Ore. 
13. Scrub Grass Coal. 
Clarion Coal. 
12. Brookville Coal. 
11. Homewood Sandstone (top of Pottsville Conglomerate). 
10. Tionesta Coal. 
