1304 



NEW YORK STATE MUSEUM 



craft mountain, 1058-60; thickness, J 

 1034, 1189; exposures near Rondout, j 

 1189-90, 1219, 1221, 1222, 1223, 

 1224, 1225; fauna, 1190-91, 1203-4. 



Niagara county mastodons, 933. 



Niagara limestone, exposures, 1083, 

 1167-69; inappropriateness of term | 

 applied to the Coralline, 1113; no 

 representative east of Herkimer 

 county, 1113; absence of from Near- 

 pass section, 1153-54. 



Nicholson, cited, 960. 



Nilsson, Anton, cited, 955. 



Noetling's law, illustration of, 1228- 

 33. 



Nucleospira, 904-5. 

 sp.?, 1188, 1207. 

 concinna, 905. 



mut. pygmaea, 904-5. 



explanation of plates, 1240, 

 1242. 



elegans, 1197, 1203, 1207. 

 ventricosa, 1189, 1193, 1203, 1207. 

 Nucula?, 993. 

 Nucula, 908. . 



cf. bellistriata, 993. 

 corbuliformis, 908. 

 mut. pygmaea, 908. 



explanation of plate, 1240. 

 lirata, 908. 



mut. pygmaea, 908. 



explanation of plate, 1240. 

 varicosa, 908. 



mut. pygmaea, 908. 



explanation of plate, 1242. 

 Nuculites, 909. 

 oblongatus, 909. 

 mut. pygmaeus, 909. 



explanation of plate, 1240. 

 triqueter mut. pygmaeus, 909. 

 explanation of plate, 1240. 



Obolella pretiosa, 952. 

 Odontocephalus selenurus, 1070. 

 Oehlertella pleurites, 991, 993, 994, 

 995. 



Office work, 865-71. 



Olean conglomerate, 982-83, 988, 990; 



age, 985, 986; fossils, 995. 

 Olean quadrangle, stratigraphic map 1 



facing p. 967; fossil faunas, 990- 

 95. 



Olean rock section, construction of, 



996-99. 

 Olenellus thompsoni, 952. 

 Olenidae, 946. 



Oncoceras expansum, 1123, 1127, 1128. 

 Oneida conglomerate, exposures, 1167. 

 Onondaga county, Siluric sections, 

 1160-65. 



Onondaga limestone, of Becraft moun- 

 tain, 1070; thickness, 1034; ex- 

 posures near Rondout, 1178, 1187, 

 1205; fauna, 1203-4. 



Onondaga salt group, gypseous deposit, 

 1162. 



Ontario, exposures near Rondout, 

 1181-87. 



Ontario county, mastodon, 931 ; Coble- 

 skill limestone, 1137-38. 

 Orange county, mastodons, 923-24. 

 Orbiculoidea, 1018. 



ampla, 1200. 



cf. discus, 1164. 



jervensis, 1203, 1206. 



magnifica, 1238. 



cf. tenuilamellata, 1150, 1151. 

 Oriskania (?) sp.1, 1193. 

 Oriskania sp.t, 1208. 



navicella, 1203, 1208. 



sinuata, 1203, 1208. 

 Oriskany and Port Ewen beds, limit 



between, 1200. 

 Oriskany beds, of Becraft mountain 



1064, 1068-69; thickness, 1034, 1069 ; 



1199; in Onondaga county, 1165; 



exposures near Rondout, 1198-1203, 



1221, 1225; of New Jersey, 1199- 



1200; two facies, 1202. 

 Oriskany fauna, 1203-4; range of, 



1205-8; affinity with Helderbergian 



1202. 



Orleans county, mastodon, 933. 

 Orthis, 1027. 



flabellites, 1173. 



hybrida, 1150, 1151. 



(Schizophoria) impressa, 992 



(Schizophoria) leonensis, 992, 993. 



plicata. 1040. 



(Schizophoria) tioga, 992, 993 



