No. 50.] 
483 
Northern alluvium, 398 
Oil spring, 449, 464 
Old red sandstone, 393, 395, 408 
Oneida conglomerate, 374 
Onondaga salt group, 375 
Oriskany sandstone, 377 
Ores of Newcomb, 273 
Peat, 216, 221, 386, 460 
Petroleum, - 55, 56 
Pentamerus limestone, 376 
Phosphate of lime, 107 
Physical geography, » 43 1 
Potsdam sandstone, 347, 363, 368 
Portage group, 391 
Protean group, 53, 374 
Primary rocks, 366 
Pulaski shales, 373 
Pyroxenic steatite, 108 
Quarries of Cattaraugus county, 468 
Report of the Geologists, 3 
J. E. Dekay, 15 
Dr. Lewis C. Beck, 45 
" Dr. Torrey, 113 
T. A. Conrad, 199 
" W. W. Mather, 211 
" E. Emmons, 259 
^* L. Vanuxem, 355 
J. Hall, 389 
Rocks, 465 
Salifereous group, 53 
Saline springs, 449, 464 
Saline efflorescences,. 450 
Salmon river sandstone, 374 
Sanford ore, 283 
Sand, 303 
Schiller spar, 109 
Scutella limestone, 377 
Schoharie layers, 378 
Septaria, 64, 98 
Seneca limestone, , 378 
Shawangunk grits, 212, 246 
Sherberne flagstones, 381 
Shells, 201 
Skaneateles shales, 380 
Silver, 463 
