ixbex. F 2 . 415 



Page. 



Mountain of X described, 10 



Muddy run, in Tyrone t., 367,368 



Murray (Laurel, Patterson) run, 230,253 



Mush (B. G.) & Co. ore, 96 



Narrows, (see Gaps,) in VIII c 2, Center t., 169,198 



Neilson's ore diggings, VIII b 1, Center t., 194 



New Bloomfield, Center t, 4 



New Buffalo, Watts t., 3 



New Gerniantown, Toboyne t., 5,349,351 



Newport, Oliver t., 4,239 



Newport bluffs, VIII/, 72,237,274 



Newport VIII c 2 fossil ore, 100 



Newport furnace, 278 



Newport limestone, local beds, high in VIII/, 224 



Newport narrows, explained ; (see Erosion,) 198 



Newport section of VIII/ (563',) 225 



Niagara formation, wanting ; (see V a b,) 52,374 



Nonconformity of VIII on V, 304,305 



North mountain ; (see Blue mountain,) 8 



North Furnace ridge, VII, Spring t., 338 



Northern Central railroad levels, 19 



Northern synclinal trough described, 31 



Oak Grove, Spring t., • 5,101 



" furnace, Rye t.; limestone point, 309; 374 



" « high knob of VII, Spring t., ... .339,374 



" " ore diggings, VIII b 1, Spring t., 340,375 



Ochre beds, VII, Carroll t., 101,161 



Ohio wharf road shows fault, 85 



Old map of Susquehanna river, 395 



Old road to Carlisle shows fault, . 85 



Oliver township described ; all hilly, mostly wooded, second growth char- 

 coal : Limestone ridge, Buffalo hill, Middle ridge, 277 



Oneida conglomerate ; (see IV a,) 43 



Onondaga formation — See V b. 



Ore banks of old Juniata furnace, Center t., .184 



Ore banks— See Iron ore. 



Ore bed, fossil; (see V a,) 45 



Ore ridge, Tuscarorat.; (see Iron SS.; Ore SS., V a 5,) 362 



Ore sandrock described ; (see V a 5,) 49,9-f 



" " chiefly instrumental in making the Blue mountain terrace in 



Tyrone t., 370 



Oriskany sandstone; (see VII,) 62 



Orton, (Dr. E.,) of Ohio, '. . . . 65.341 



Outlaw's cave ; (see Girty,) 151 



Overthrown; (see dips,) 181,285,310 



Pakeozoic formations. 36,37 



Palaeozoic river, possible source of VIII c 2, 310 



Passage beds of V b, 51 



» VIII e to VIII/ in Centre t., 207 



Patterson, in Juniata county, 257,259 



Patterson's (Laurel, Murray) run, Madison t., 253" 



