66 



NEW YORK STATE MUSEUM 



Gneisses, 53*, 548, 559 ; age, 6II ; char- 

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

 571 ; how produced, 562. 



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

 amphitheaters, 63*; quartzite, 61^. 



Granite, 53*; distribution and charac- 

 teristics, 54^-553; age, 616. 



Graphite, 53^. 



Gravel plains, 528. 



Gravels, incoherent, 53*. 



Gravels and sands, water-sorted, 59^- 

 603. 



Hall, James, acknowledgments to, 51^. 

 High Falls, altitude, 529 ; granite, 549; 



trap dike, 589. 

 Hornblende, 539, 543^ 558, 588^ 642. 

 Hudson river, headwaters, 52'^. 

 Huronian rocks, 608. 

 Hypersthene, 558, 572. 



Ice, action of, 63^. See also Moraines. 

 Indian pass, 52^. 



Jay, gneisses, 56'^. 



Keene, boulder, 59'^; crystalline lime- 

 stone, 53'^; gneisses, 568; granite, 

 551 ; quartzite, 54*; Weston mine, 

 642. 



Keene valley, abandoned road, 522; 

 deltas, 601; lake bottoms, 60^. 



Labradorite, 57i, 63'?; 'augen,' 559. 



Lake bottoms, abandoned, 53^, 599, 

 603, 635. 



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

 tude, 529; anorthosites. 58* ; boulder, 

 595; deltas, 602; drainage, 52^; evi- 

 dences of glacial period, 59^; geo- 

 logic age of rocks, 609; gneisses, 

 56'?; topography, 51^. 



Laurentian rocks, 60'?. 



Limestones, 638; age, 609. g^g ^Iso 

 Crystalline limestone. 



Mclntyre, Mt, 5^, 52*; altitude, 53i. 

 Magnetite, 558, 538^ 641, 642. 

 Marble mountain, anorthosites, 579. 



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



585. 

 Mesozoic era, possible history, 621. 

 Metamorphic rocks, term, 56^. 

 Microperthite, 552, 558. 

 i Mineralogy, 63'?-643. 

 [ Mirror lake, 59*. 

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

 I 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 li mestone, 53^; 



quartzite, 54*. 



Orthoclase, 552. 



Paleozoic era, possible history, 621. 



Pebbles, 599. 



Pitchoff mountain, 522; altitude, 531; 

 gneisses, 56'?; limestone, 61*. 



Phigioclase feldspar, 575, 588. 



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



Porter, Mt, 52^; altitude, 531. 



Potsdam sandstone, rests on meta- 

 morphic rocks, 61'? ; boulders, 628. 



Pulpit mountain, altitude, 533; gneiss- 

 es, 56'?. 



Pyrites, 641. 



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 j 

 age, 609. 



Quaternary period, probable history, 

 62'?. 



Red Rocks, quartzite, 54*. 

 Elvers, courses how determined, 62^. 

 Rocks, characteristics, 57i ; geologic 

 age of, 60*-63'? ; varieties, 533. 



