382 GEOLOGY OF OHIO. 
The names of the counties are appended in order, from north to 
south : 
Trumbull, Perry, 
Mahoning, Hocking, 
Stark, Vinton, — \ 
Columbiana, Jackson, 
Carroll, Gallia, 
Tuscarawas, Scioto, 
Muskingum, Lawrence. 
Licking, 
A brief review of these several counties named in the preceding 
lists will now be made with reference to their supplies and production 
of ore. 
1. Iron OrEs oF TRUMBULL AND MAHONING COUNTIES. 
The only ore of these counties that possesses any present impor- 
tance is the blackband of Mineral Ridge and vicinity. The geological 
relations of this seam have already been shown on page 174 of the 
present volume. The facts pertaining to its discovery, and to its first 
use in furnaces are also given in chapter IV, p. 320. 
The field in which it occurs is quite limited, and the deposit is now 
verging to exhaustion. The facts in regard to its mode of occurrence 
and general conditions are well known, and it has not therefore seemed 
incumbent upon the present survey to spend time upon this deposit. 
An analysis by Wormley, representing the general character of the 
ore, is repeated here from volume III: 
SPC CHIC OLAVIEY. cvcocne sastsseaerncsseceselnoee ces saeeee ne necee ener ccenaeetacceceees 2.49 
Violatillesmattere..cdocesseasceees Nis onal Mestre eee Maes oaks sega dteeemce cts 30.50 
SHIiCLOUS MATTER Vek. 2 hayes. cee eee ncralt a waavuemeains Socauien cece noe e teeaneneon 11.84 
CarhHOnaterOianoOmies, ccc ocaessesceece toca noucsss see seeeceatees ene cee eeeeeen baat aeatte 43.26 
SEKQUIO RICE! Of MTOM Gere sci. hSeccsstameceasttocttrcesscacseccmtocemaecncinenee ss 9.94 
AUN Oe eee le sae eici ee asia oactogae see eenee tine neem etiae ee cmelnae mes PEE Oe Trace. 
Oxide of manPaneses2c..citesn. css bars nceeeeccecemere sees cimoestaa een ouene es samemnent 1.00 
Phosphate of lime ............00 doslae'esareeateile demas section semacarcastns eeeannawacaas Trace. 
Carbonate of Time ie ciicen ceria ceases se sorecenare coeeee asin or act eae eee ee es 1.87 
Carbonate of smagnesiaen stn eecseeedicseses lana itae ease te ate tote nee aneae es 2.03 
Sulphur » va stele'baw Ade Seltialee apitaeutet camara ae sate sie stiecteceictee enue tle netstat Re ciate 0.18 
Totals delenit Ra ere ay Rea a Dante cae aaa ain ee cetera .. 99.62 
Metallic inom céccea yan shove des nenee ates ae ae aera ne a aee tay ae Soars 27.12 
Phesphioriclacid’ .2.. nee ee jpasove9000a00000 200080 dood 260000 Trace. 
