

INDEX. F. 411 



Page. 



Inoculate bridge, outcrop of VIII c 2, iron ore, Centre t., 204 



" " fossil ore, VIII c 2, 100 



Inoculate ridge made by VII, in Miller t., 268 



Intermediate fault ; see Fault, 91 



Iron furnaces, 102 



Iron ore beds described in Chapter V, 93 



11 of V a, at Millerstown, only sand vein worked, 363 



" of V a— See V a. 



" of VII wanting all over Perry county, ... . . 101,187 



11 on top of VII, in Centre t., at Juniata furnace, Ruder's, Garling's, 



Powers' &c, 187,188 



" on top of VII, in Centre Mills section, Madison t., 262 



" of VIII b 1, Marcellus brown hematite, 64 



" " " Clouser's, Ruder's, Long's, 96,97 



" " " in Centre t. described, 191 



11 " " thick when the limestone is thin, and v. v., 193 



" " " hematite at crop, carbonate below, 194 



" u " fine display on road, Madison t., .... . ... 263 



" " mined considerably on hill opposite Oak Grove furnace, Ty- 

 rone t., 375 



" " 2' thick in VIII c 3, local to Wheatfield t., 391 



" " " in white and black clay, vertical, Oliver t, 279 



" " " diggings in Spring t., 340 



« " " —See also VIII b 1. 



" of VIII c 2, Hamilton fossil ore, 69 



" " " —See also VIII c 2. 



11 of VIII e, top of Portage, worthless, 101 



" in IX thin seams of red hematite, Rye t., 102,316 



11 in X Pocono, with coal, poor, 102,293 



Iron ridge ore banks, 14,98,197 



Iron sandstone— See V a 2. 



" " of Bower mountain, 367 



" " crop high on Blue mountain, 370 



" " " makes visible terrace, . .370 



1 '• " thicker in Tyrone than further north, 370 



Ironstone ridge=Great Horseshoe trap dyke. 



" " inPennt., 296; in Rye t., 316 



Islands in the Susquehanna river, 241 



Jackson township described, 229 



Juniata=Milford, 4 



Juniata township described, generally cultivated, hilly N. part wilderness, 235 



" " entirely composed of VIII /and IX, .237 



Juniata river described ; " Cheniaty," . . 17,22; 395 



•• u carries 1,000,000 cubic yards of rock down annually, 39 



" " great bend, 235 



Juniata bridge, (trap dyke,) 300 



Juniata furnace, 184; ore bank, (VIII c 2,) 100,192 



" " " large and abundant, 195 



Juniata furnace gap, VIII c 2, Center t., . . . 198 



Junkin's (Judge) section in Carroll t., 166 



Junkin's ridge made by Kingsmill SS., 165 



