SUPPLEMENTAL REPORT—HANGING ROCK DISTRICT. 907 
found throughout its substance, often in an exquisite state of preserva- 
tion. Insect remains are to be expected here. The ore was first recognized 
’ with all of these peculiarities by the geologists of the First Survey. The 
locality at which they found it is one of the best known to-day, viz., the 
Whitmore farm on Snow Fork, a mile east of Bessemer. It is designated 
in the section as the Snow Fork ore. 
It was mined toasmall extent in the earlier iron making of Ohio on 
land now owned by Charles Robbins, opposite Nelsonville, and was 
worked in the old Mary Ann Furnace of Licking county. But the ore 
although sufficiently rich in iron is of a character that the charcoal 
furnaces avoid and has, therefore, been almost entirely neglected in 
Ohio. 
The seam can be followed without interruption from the Hocking Val- 
ley to the Ohio River and beyond. Its average thickness can not be less: 
than that of the limestone ore, but it is spread through more space and is 
much less reliable. 
The so-called Phosphorus ore of Hamden Furnace lies very near this 
horizon—if it does not actually represent it. Itis found in a heavy seam 
two to four feet in thickness, and the ore is promising in appearance— 
but no efforts to make marketable iron out of it have proved successful. 
Analysis shows as much as seven to eight per cent. of phosphate in 
some parts of the seam. 
12. In reaching the next ore seam we pass one of the most marked 
geological horizons of this part of Ohio, viz., that of Coal No. VI—the 
Nelsonville coal, of the Hocking Valley; the Carbondale or Mineral 
City coal, of the Marietta and Cincinnati Railroad; the Webster or 
Lower Waterloo, of Gallia county; the Sheridan coal, of Lawrence 
county, and the Ashland or Coalton coal, of Kentucky. The acy of 
- all these coals is now fully established, as will be shown on a subsequent 
page of this report. 
Forty feet above Coal No. 6,in the Hocking Valley, a buff limestone is 
very frequently found which sometimes bears an iron ore—is sometimes 
indeed represented gaete laced by an iron ore. The ore occurs either 
in massive nodules, or in a layer fifteen to eighteen inches thick. 
Analysisindicates an ore of good quality, but it has not yet been subjected 
to the test of the furnace in this part of the field. In Southern Ohio, and 
more particularly in Kentucky, there is a widely distributed ore at about 
forty feet elevation above the Sheridan coal, which is known as the Yellow 
Kidney. It is an excellent ore, and is welcomed by every furnace man- 
ager. 
Identity of sections in such widely removed localities as Nelsonville 
