66 



NEWYOKK STATE MUSEUM 



Gneisses, 53*, 54^, 56^ ; age, 611 j char- 

 acteristics, 55^-566; distribution, 56^- 

 571 ; how produced, 562. 



Gothics, 51"^; anorthosites, 61^; glacial 

 amphitheaters. 634 j quartzite, 61^. 



Granite, 53* ; distribution and charac- 

 teristics, 549-553; age, 616. 



Graphite, 53^. 



Gravel plains, 52^. 



Gravels, incoherent, 53"^. 



Gravels and sands, water-sorted, 59^- 

 603. 



Hali, James, acknowledgments to, 512. 

 High Falls, altitude, 52^ ; granite, 54^; 



trap dike, 58^. 

 Hornblende, 53^, 543, 558, 538^ 642. 

 Hudson river, headwaters, 52'^. 

 Huronian rocks, 60^. 

 Hypersthene, 55^, 572. 



Ice, action of, 632, g^e also Moraines. 

 Indian pass, 523. 



Jay, gneisses, 56'^. 



Keene, boulder, 59'^; crystalline lime- 

 stone, 53'^; gneisses, 56^; granite, 

 551 ; quartzite, 54*; Weston mine, 

 642. 



Keene valley, abandoned road, 522; 

 deltas, 601; lake bottoms, 603. 



Labradorite, 57^, 63''"; 'augen,' 55^. 



Lake bottoms, abandoned, 53^, 59^, 

 603, 635. 



Lake Placid, age of trap dikes, 62i; alti- 

 tude, 529; anorthosites. 58*; boulder, 

 595; deltas, 602; drainage, 525; evi- 

 dences of glacial period, 593; geo- 

 logic age of rocks, 60^; gneisses, 

 56*^; topography, 51^. 



Laurentian rocks, 60'^. 



Limestones, 63^; age, 60^. See also 

 Crystalliue liinostone. 



Mclntyre, Mt, 51^, 52^; altitude, 53i. 

 Magnetite, 558, 538^ 64i, 642. 

 Marble mountain, anorthosites, 57^. 



Marcy, Mt, 51'^; altitude, 53^; peaks, 



585. 

 Mesozoic era, possible history, 62^. 

 Metamorphic rocks, term, 563. 

 Microperthite, 552, oo^. 

 Mineralogy, 63^-643. 

 Mirror lake, 59*. 

 Moraines, 528, 534^ 592-599, 62^. 

 Mountain slopes, configuration, 629. 

 Mountains, see Cascade mountain; 



Cobble Hill ; Eagle Eyrie ; Giant ; 



Gothics; Marble; Pitchoff; Pulpit; 



Sentinel; Scotts Cobble. 



Norite,57*. 



North Elba, boulder at John Brown's 



grave, 59'^ ; crystalline limestone, 53^; 



quartzite, 54*. 



Orthoclase, 552. 



Paleozoic era, possible history, 62i. 



Pebbles, 599. 



Pitchoff mountain, 522; altitude, 531; 

 gneisses, 56'^; limestone, 61*. 



Plagioclase feldspar, 575, sgs^ 



Plains, gravel, 528 j sandy, 528, 6O2. 



Porter, Mt, 523 . altitude, 53i. 



Potsdam sandstone, rests on meta- 

 morphic rocks, 61"^ ; boulders, 628. 



Pulpit mountain, altitude, 533 j gneiss- 

 es, 567. 



Pyrites, 64i. 



Pyroxene, 538, 546^ 558^ 572^ 639, 642. 



Pyroxene crystals, 542. 



Pyrrhotite, 539. 



Quartz, 539, 551, 558, 642. 



Quartzite, 53*, 615; cliffs, 54?; distri- 

 bution and characteristics, 54*-549 ; 

 age, 609. 



Quaternary period, probable history, 

 627. 



Red Rocks, quartzite, 54*. 

 Rivers, courses how determined, 626. 

 Rocks, characteristics, 57i ; geologic 

 age of, 60*-637; varieties, 533. 



