452 



NEW YORK STATE MUSEUM 



Paleozoic topography, 419 8 -21 8 . 

 Peneplains, 417 s , 425 2 -27 2 . 

 Perkins, cited, 375 5 , 376 1 . 

 Perovskite, 398 2 . 

 Phlogopite, 295 5 , 296 5 . 

 Placoparia (Calyminene) multicosta, 

 367 3 . 



Plagioclase, 329 s , 336\ 



Pleonaste, 329 6 . 



Porphyry, 355 7 ; syenite, 348 3 . 



Postglacial history, 293 8 -94 5 . 



Potsdam formation, 279 9 -81\ 354 2 - 



60 7 , 387 1 -88 7 ; thickness. 358 5 . 

 Precambric disturbances, later, 278 1 . 

 Precambric erosion, 276 8 -77 4 . 

 Precambric faulting, 403 5 -5 5 . 

 Precambric history, 273 2 -79 3 . 

 Precambric igneous activity, 278 4 - 



79 3 . 



Precambric igneous rocks, late, 345 5 - 

 54 2 . 



Precambric rocks, 294 G -354 2 ; folia- 

 tion, 399 9 -402 5 ; joints, 404 4 . 



Prepotsdam topography, 418 2 -19 8 . 



Prosser, cited, 363 7 , 372 1 , 372 3 , 373 4 , 

 377 3 , 377 s , 378 6 , 379 4 , 384 3 , 392 2 , 

 411 3 . 



Pyrite, 295 8 , 304 6 , 309 s , 313 6 , 319 5 , 

 329 6 . 



Pyroxenes, 295 5 , 295 8 , 296 4 , 300 7 , 

 301 3 , 305 1 , 309 9 , 311 4 , 314 9 , 815 8 , 

 323 5 , 328 9 , 330 7 , 337 7 , 349% 398 2 . 



Pyrrhotite, 304 6 , 309 8 , 329 6 . 



Quartz, 295 5 , 297 3 , 300 2 , 304 6 , 309 7 , 

 309 s , 309 9 , 311 6 , 313 5 , 313 6 , 313 8 , 

 314 2 , 319 4 , 321 4 , 323 3 , 326 7 , 328 9 , 

 334 4 , 33o 8 , 337 2 , 338\ 338 6 , 348 6 , 

 352 5 , 352 s , 352 7 , 355 2 , 356 1 , 356 7 , 

 395 6 , 395 8 . 



Quartz augite syenite, 340 1 ; analy- 

 ses, 333 5 , 339 7 , 353 5 . 



Quartz norite, analyses, 334 8 . 



Quartz syenite porphyry, analyses, 

 353 5 . 



Raquette river, 439 1 , 443 1 , 444 6 . 

 Rhynchonella plena. 367 4 . 

 Ridges, northern, 434 3 . 

 Ries, Heinrich, cited, 448 9 . 



Rock structures, 399 5 -416°. 



Rome river, 442 2 . 



Ruedemann, Rudolf, cited, 393 9 . 



Sacandaga river, 439 5 , 441 6 . 

 St Lawrence valley, 438 4 . 

 St Regis river, 439 1 , 443 1 . 

 Saranac formation, 299 6 -303 3 . 

 Saranac river, 439 6 , 440 4 , 442 9 , 443 6 . 

 Scapolite, 295 5 , 304 7 , 329 6 , 352 2 . 

 Schists, 273 3 , 295 7 . 

 Schroon river, 439 5 . 

 Scolitus minutus, 361 8 . 

 Seeley, cited, 361 2 , 365 4 , 374 8 , 376 4 , 

 383\ 



Serpentine rocks, 295 6 . 

 Sillimanite, 295 8 , 296 s . 

 Smyth, C. H. jr, cited, 302 3 , 315 4 , 



316 3 , 317 5 , 329 9 , 330 6 , 346 4 , 388 s , 



397 8 , 398 3 , 447 9 ; acknowledgments 



to, 271 6 . 

 Solenopora compacta, 367 3 . 

 Sphaerexochus parvus, 366 9 . 

 Spinel, 329 s . 

 Stenopora, 367 3 . 

 Streams, 437 8 -45 5 . 

 Strophomena sp., 366 7 . 



incrassata, 367 3 . 

 Syenite porphyries, 348 3 , 354 1 , 355 7 ; 



analyses, 351 3 , 353 5 . 

 Syenites, 275 s , 312 2 -22 5 , 338°, 340 4 , 



346 7 ; analyses, 333 1 , 336 5 , 339 8 ; 



amount of differentiation of, 325 3 - 



26 4 ; granitic phase of, 323 3 -25 3 ; 



mineral composition, 313 4 -14 4 ; 



other areas, 316 9 -18 9 ; relation to 



anorthosite, 318 9 -22 3 ; variability 



of, 314 4 -16 9 . 



Titanite, 309 8 , 311 s , 313°, 313 s , 319 4 , 



329 6 , 348 7 , 356 3 . 

 Titanium. 353 6 . 



Topography, 416 7 -48 8 ; at close of 

 erosion interval, 277 4 ; paleozoic, 

 419 8 -21 8 ; Prepotsdam, 418 2 -19 8 . 



Tornebohm, cited, 330 7 . 



Trachytes, 395 5 -96 1 . 



Tracy brook fault, 431 9 . 



Ti-enton formation, 283 9 -84 6 , 373 4 -82 3 , 

 393 2 ; thickness, 376 4 . 



