STRATIGRAPHICAL ORDER. 125 
Feet. 
Putnam Hill limestone. 
Coal—Brookville ? Winters coal, Conway coal? No. 4 of New- 
berry. . 
Ore—Limestone kidney. 
Inn tenvialaecseccccotosetscccwisece sh sscesscccdeccsosnscdessevececsscseseucwsecss 20 to 30 
Coal—Tionesta? Newland coal, No 36. 
Hnterivialeoscece tastes ercedee se cssssascscceeses dee Sencragececsecesess eres 10 to 20 
Ore—Dunkel Block, Franklin Block, Main Block. 
Upper Mercer limestone or flint. 
Coal—U pper Mercer. 
nate rvall temwescmaen eects cc esccunce usec atlesiacttosiscralserceSete sv eseciscesectesests 30 to 60 
Ore—Lower Mercer, Blue limestone block, Little block. 
Lower Mercer limestone. 
Coal—Lower Mercer. 
The whole interval between the Lower Mercer and Ferriferous 
limestones ranges between 90 and 160 feet. It is quite steady at the 
latter figure in Lawrence county. In northern Vinton it is about 100 
feet, but in the central parts of the county it becomes 130 to 140 feet. 
The object for which this chapter was undertaken has now been 
accomplished. ‘The series with which we set out at Lowellville, on the 
Pennsylvania, line has been traced around the entire Ohio border of the 
Lower Coal Measures. It has been made plain that a large number of 
these horizons, and that some of the individual elements, are continuous 
throughout the whole extent of country that has been traversed. The: 
Freeport Group, the Kittanning Group, and the Mercer Group can be 
named as signal examples of this persistency. Toa considerable extent, 
lithological and chemical characteristics are maintained in the several 
members of these horizons throughout their entire extent. The state- 
ments which would properly describe the Lower Mercer limestone in 
Mahoning county would describe it in Jackson or Scioto counties with- 
out the change of a word. The same thing is true of the Freeport 
limestones. 
The Kittanning clay retains the same characteristics in Lawrence 
county, Ohio, that it has in Lawrence county, Pennsylvania. The 
Limestone ore of the Hanging Rock field has the same peculiarly excel- 
lent quality that characterizes the Buhrstone ore of Western Pennsyl- 
vania. 
The Kittanning coals are noted for their steadiness throughout all 
of the territory that they occupy, while the Freeport coals are every- 
where sporadic and uncertain. | 
