SUPPLEMENTAL RBPOKT — HANGmG 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 to a small 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. It is 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 identity of 

 all these coals is now fally established, as will be shown on a subsequent 

 page of this report. 



Forty feet above Coal No. 6, in the Hocking Valley, a bufE limestone is 

 very frequently found which sometimes bears an iron ore — is sometimes 

 indeed represented and replaced by an iron ore. The ore occurs either 

 in massive nodules, or in a layer fifteen to eighteen inches thick. 

 Analysis indicates 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 



