692 



GEOLOGY OF OHIO. 



30, Dover township, about fifty-five feet above the Ames limestone, is 

 the outcrop of a conglomerate twelve feet thick, a mixture of small 

 lime iron ore and small stone nodules, containing evidently so large a 

 percentage of iron as to make it a valuable ore if it contains no dele- 

 terious substances. In this imm^ediate neighborhood forty feet of the 

 shales above the Ames limestone a«e highly ferruginous, and bands of 

 good ore are to be seen at so many elevations that their outcrops cannot 

 be reduced to a system. The ore is most of it well oxydized, apparently 

 rich and like the Fulton ore, and there are places where it is probable 

 that this whole thickness of forty feet will be worked for the ore. The 

 upper, soft ores, which are remarkably rich and well oxydized, will prob- 

 ably present very different characteristics when the excavations are 

 carried into the hills and beyond the reach of atmospheric influences. 

 They are nearly all blue carbonates changed at the outcrops to sesqui- 

 oiides. Some are calcareous, and from the soluble character of the 

 limestone this is often dissolved out, so that the ore is concentrated as 

 well as peroxydized, and such will pass into ordinary calcareous ores 

 when impervious cover is reached. 



The following analyses of these ores have been made by competent 

 chemists : 



No. 1, Dover township, seventy-three feet below Ames limestone. By S. B. Newberry. 

 No. 2, ore No. 4, Section 7, Trimble, (raw) " 



No. 3, 

 No. 4, 

 No. 5, 

 No. 6, 

 No. 7, 

 No. 8. 



" " (roasted)^.. 



No. 5, Jones' land, Trimble township. 



" MudFork 



" Hope bank, Trimble 



No. 8, Jones' land, " 



No. 4, shale ore, " 



