‘THE IRON ORES. | 431 
counted the real limit of the series. The ores of which account should 
be taken, are the following: . 
7. Oak Ridge ore. 
Cambridge limestone. 
Mate tevialleesconiceaeecce mca tieacenc cos scokitcc cece bese ensesstesiicasscvesseeces 120 feet. 
6 Hallelujah ore of Mt. Vernon Furnace. 
; Banda ore of Gallia Furnace. 
Ma tervia lewencstess caters maces cer tlonac tach celesesislciess secocsencets es 20 feet ? 
5. Peterson ore of Olive Furnace (Waterloo or Upper Freeport 
coal? No. 7). 
Imtervaleeeeessee eee UR, Bess STAIRS e ste Nantes 1C to 15 feet? 
4. Little Yellow kidney ore. 
UM CST Val lees soens teraartswationoni sco stcteeee seoceaceseetecusadaeeteaeett 40 to 50 feet. 
Hatcher or Lower Freeport coal, No. 6a. 
3. Yellow kidney ore. 
MSE Vial eR enero eee eh cceasatesittascenileesemmetesantectseusea seer slees 40 to 50 feet. 
Sheridan or Middle Kittanning coal, No. 6. 
2. Black or Red kidney ore. 
MNCS Tava ieee etree ees aa nena a cece ste ise ecsinedesteee des aateasera depots 20 to 30 feet. 
1. Phosphorus ore of Hamden Furnace. 
New Castle or Lower Kittanning coal, No. 5. 
Intenvalleotc. sccsondseceacsss Ritu ec aise ecemmenmacesssncaataitiee cece 25 to 35 feet. 
(Limestone ore.) 
Of these seven ores the first and the last make no addition to the 
resources of the district, but they demand a place in the series because 
they have been mined and worked to some extent. Questions may be 
raised as to numbers 4, 5 and 6. They occur in close proximity, and 
some may be inclined to refer them to a common horizon, but the 
separation indicated above seems, on the whole, to express the true 
order. Positive statements are not warranted in regard to this matter. 
To correlate them with the series of the Hocking Valley; the Little 
Yellow kidney must be referred to the horizon of the Straitsville ore ; 
the Peterson ore would then represent the Upper Freeport or black- 
band horizon, and the Hallelujah or Banda ore would come in at 
the horizon of the Dugway ore, which probably belongs at or near to 
the horizon of the Brush Creek limestone. The leading members of 
the series are Nos. 3 and 2. Each member of the group will be briefly 
characterized. — 
The so-called ‘Phosphorus ore” of Hamden Furnace is an ore of 
good volume and appearance, but it runs so high in phosphorus, that 
it cannot be counted a proper source of pig iron. Some analyses of it 
