Index 



Actnowiedgments, 451, 

 Adirondack forest, disappearing, 453. 

 Adirondack rocks, early Precambric 



age, 453. 

 Alaskose, 511. 

 Allanite in syenite, 516. 

 Amphibolite, in anorthosite, 476; in 



Long Lake gneiss, 465. 

 Amphibolites, 464; pyroxenic, 527. 

 Amphibolitic gneisses, 464. 

 Andesin in Grampus gneiss, 468. 

 Anorthosites, 455; Whiteface type, 



468; description, 470-76; gabbro 



border, 473-74; outliers, 474-76; 



syenite younger than, 479; as 



building stone, 502. 

 Apatite, in anortliosite, 475; in 



Grampus gneiss, 468; in Grenville 



rocks, 508, 509; in syenite, 512, 516, 



518, 520, 522, 523, 524. 



Augite, in anorthosite, 471, 475; in 

 Grenville rocks, 526, 527 ; in syenite, 

 512, S15, 516, 524. 



Batholites, 454. 



Big Simons pond, 452. 



Big Tupper lake, 452. 



Biotite, in Grampus gneiss, 468: in 



Long Lake gneiss, 464; in syenite, 



516, 518, 523. 

 Bronzite, in syenite, 516. 

 Building stone, 502-3. 



Catlin lake, 452. 



Chalcopyrite, in anorthosite, 471, 475. 



Chlorite in granite, 510, 511. 



Cold river belt, 459. 



Corundum in granite, 511. 



Dana, J. D., cited, 507. 



Diabase, 484. 



Dikes, 456. 



Diopside in Grenville rocks, 461, 



Drainage lines, 493-95. 



Drainage modifications, 499-502. 



529 



Economic geology, 502-3. 



Faults, 457, 488-90. 



Feldspar, in anorthosite, 471, 475, 476 ; 

 in border gabbro, 474; in diabase, 

 484; in Grampus gneiss, 468; in 

 granite, 482, 510, 511 ; in Grenville 

 rocks, 461, 504, 505, .507, 508, sog, 

 5 10, 526; in Long Lake gneiss, 464; 

 in syenite, 477, 478, 512, 516, 518, 

 520, 521, 522, 523, 524. 



Foliation, 484-85. 



Follensby pond, 452. 



Gabbro border of the anorthosite, 

 473-74- 



Gabbros, 455, 465, 466; description 

 483-84- 



Garnet, in anorthosite, 471, 472; in 

 gabbro, 483 ; in border gabbro, 474 : 

 in syenite, 477, 478, 480, 512, 515, 

 516. 



Garnetiferous gneisses, 462. 



Geology of Long Lake quadrangle, 

 453-59. 



Glacial deposits, 495-97. 



Glacial erosion, topography modified 

 by, 498-99. 



Glaciation, 495-502. 



Gneisses, of igneous origin, 454; 

 doubtfuI,'455, 463 ; quartz, 460; sedi- 

 mentary, 461; as building stone, 502. 



Grampus gneiss, 463, 467-69. 



Granites, 455, 478; description, 482- 

 83; dikes cutting anorthosite, 475; 

 as building stone, 502; petrography, 

 510-12; analysis, 525. 



Granitic gneiss, 467, 469. 



Granitic syenite, 478. 



Graphite in Grenville rocks, 461, 502 

 S06, 508. 



Grenville series, description, 454, 459 ; 

 associated rocks, 462; uniformity 

 of structure, 462; lie in downfaulted 

 troughs, 490; petrography, 504, 525. 



