476 New York State Museum 



Original structures, 41 

 Oriskanian, 370 

 Oriskany sandstone, 379 

 Ormers, 141 

 Ostracods, 257, 262 

 Oswayo shales, 426, 428 

 Oswego sandstone, 291 

 Overlap, 45 



lake regressive, 46 



marine regressive, 45 



marine transgressive, 45 



progressive, 45 



transgressive, 46 

 Overturned anticline, 52 

 Oyster drill, 109, 151, 167, 168, 172 

 Oysters, 103 



American, 167, 168, 172 

 Ozarkian formations, fossils, 244 

 Ozarkian period, 219, 226 



life, 232 



literature, 247, 300 



New York formations, 233 



Pacific Province, 227 

 Packard, E. L., cited, 182, 451 

 Paleogeographic maps, 219 

 Paleozoic era, 211-19 

 Palisade diabase, 432 

 Pamelia limestone, 278 

 Panama conglomerate, 425 

 Paradoxides fauna, 228 

 Parallel linear structure, 73 

 Parallel unconformity, 58 

 Parasites, 113, 177 

 Parchment shell, 139 

 Parks, W. A., cited, 210, 247, 446 

 Parrish limestone, 400 

 Pearse, A. S, cited, 182, 451 

 Peat, 21 

 Pebbles, 30, 43 



