Index 475 



Nassau beds, 234 



Nautilus, paper, 174 



Necks, 63, 65 



Neelytown limestone, 244 



New Scotland limestone, 374 



Newark series, 432 



Newland, D. H., acknowledgment to, 14 



cited, 211, 450 

 Newland, D. H. & Hartnagel, C. A., cited, 211, 353, 451 

 Niagaran (Silurian) beds, 21 

 Nonconformity, 58 

 Normanskill shales, 279 

 Northeast shales, 407 



Nudibranchs, 96, 109, 122, 123, 127, 136, 140, 172 

 Nummulites, 19 

 Nunda sandstone, 402 

 Nut shells, 167, 169 



Oar weed, 90 



Ogdensburg dolomite, 271 

 Olean conglomerate, 428 

 Olenellus-bearing beds, 237 

 Olenellus fauna, 228 

 Olivine, 69 



Oneida conglomerate, 324 

 Oneonta sandstone, 404 

 Onondaga limestone, 385 

 Oolitic rocks, 18 

 Ordovician period, 248 



classification of formations, 268 



climate, 263 



fossils, 295 



life, 257 



literature, 300 



New York formations, 263 

 Ordovician strata, thickness, 267 

 Organic precipitates, 17 

 Organic sediments, 24 

 Organic tissues, 17 

 Original dip, 41 



