INDEX. 
646 
Granite of Highlands east of the Hud¬ 
son, 516 - 620, 525 - 528. 
— west of the Hudson, 534 537. 
— New-York island, 516 - 524, 534 
582 - 604. 
— sienitic, 542. 
— Staten island, 517. 
— called stratified, 535. 
— veins (vide Veins), 
— Pineplains, 548. 
Graphic slate, 372, 421, 434. 
Graphite. 
Graptolites, 373, 378, 384, 390, 391 - 
395, 420. 
Graptolitic slate, 367. 
Granite veins, 467. (Vide veins.) 
Graywacke, 371, 377, 383. 
— slate, 367, 371. 
— shale, 367. 
Granular limestone of taconic rocks, 
425. 
— quartz rock, 436, 439, 440, 441, 
446 (of Highlands). 
Grammatophora, 50. 
Gravel beds of the quaternary, 126, 
129, 140. 
— how situated topographically, 148 
-149. 
— consolidated, 160. 
Gravitation, 632. 
Grey sandstone, 355. 
Grey sparry limestone, 325. 
Great Hog-neck near Sagg-harbor, 25. 
Great-kill meadows, 18. 
Great Neuten-hook, alluvial of, 7. 
— south beach of Long island, 28. 
— origin traced, 29, 30. 
— West bay marshes, 18. 
Green mountains furnish alluvia to 
Hudson valley, 5. 
Greenbush sulphur spring, 91, 92. 
Green slate, 367. 
Green-river valley coal, 3. 
Greenstone, age of, 627. 
Greenstone, 278, 283. 
— of Palisades, 477 - 479. 
— in metnmorphic rocks, east of the 
Hudson (Highlands), 531 - 532. 
— in metamorphic rocks, west of the 
Hudson (Highlands), 539 - 541. 
— dykes,. 546. 
— granular, 533, 540. 
— primitive, 540. 
Greenville, fossil bones of, 44. 
Grindstones, 316. 
Grits and shales of the Catskill divi¬ 
sion, 300 -316. 
Grooves and scratches due to lower 
drift (note), 136. 
Grooves and scratches, 198, 207 - 211. 
— tables of, 199 - 206. 
Ground ice as a means of alluvial 
transport, 41, 226-227. 
— cause of formation, 42. 
— facts concerning, 227. 
Gulf stream cause of quaternary depo¬ 
sitions, 150, 155. 
— influence of, in drift epoch, 221 - 
225. 
— influence of, in Long-island divi¬ 
sion epoch, 274, 275. 
Gulf of Mexico, communication of with 
the St. Lawrence, 155. 
Gull islands, 20. 
Gullies formed by alluvial action, 42,43_ 
Gurhoffite, 482. 
Gypsum (sulphate of lime), 83, 354. 
13. 
Hackley, Prof., 639. 
Hall, Prof., 152, 153, 190. 
Hamilton group, 317. 
Hard water, 145. 
Haverstraw flats, (alluvial), 9. 
— gas spring, 107. 
Hearths for furnaces, 285, 286. 
Helderberg division, 2, 305, 324-353. 
— localities out of the general range, 
350 - 352. 
Hemantidium, 49. 
Hematite of Townsend’s ore bed, 351, 
364, 365; (Vide limonite.) 
Hempstead harbor spits, 28. 
Hepatic springs, 91. 
Hewlet’s point (encroachment of sea), 
23. 
Hicks, Edmund, 29. 
Highlandite, perhaps allanite, 512. 
Highlands, quarternary of, 2, 156. 
— channel through, age of, 156. 
— primary of, 13. 
Hipparionix, 339, 342. 
Hitchcock, Prof., 108, 294, 464, 691. 
Hog inlet, progress westward, 29. 
Holmesite, 467. 
Hones, 417. 
Hoosick, alluvial depositions of, 5. 
— gaseous springs, 104. 
Hopkins on geological dynamics, 219. 
Horton, W., 113, 119, 185, 351, 363 
364, 370-372, 392, 401, 412-414’ 
416, 476, 477, 490, 541,' 566, 567, 
569, 570, 571, 572, 573, 574, 577 
-579. 
Hornblende,, 458, 488 -508, 516-520, 
529, 578. 
— rock, east of the Hudson, 533- 
534. 
— west of the Hudson, 541. 
Hornblende, granular, 575. 
Hornblendic gneiss, 459, 516-620. 
— rocks, 458, 459, 477, 516 - 620. 
— slate, 459. 
— green and crystallized beautifully, 
569. 
— masses of, in the white limestones, 
466. 
Hornstone, 339, 347, 397, 413. 
Horse, in mining, 563. 
Horsenclever, (Baron), his mining ex¬ 
plorations, 117. 
Houghton, Dr., 191. 
Houghton, geology of Michigan, 3. 
Hudson, alluval depositions, of, 5. 
— Ooze island and marsh near, 7. 
— anticlinal axis, 357. 
— land-slip, 36, 
— tufa, 81. . 
— river slate series, 366 - 422. 
— river group, 2. 
— group, of this volume, 367, 369- 
— age of, 626. 
— slate group, group of reports, 366 
-422. 
— flats and plains of quaternary, 2. 
Huntington harbor, alluvial changes, 
26. 
Hurlgate, 2. 
Hyalite, 562. 
Hydraulic cement, 328-330, 403. 
— limerock, 325, 349. 
Hydrogen, carburetted, 114. 
— sulphuretted, 91-94. 
Hydrous anthophyllite rock, 461. 
Ice, a means of transportation of allu¬ 
via, 39, 42, 451. 
— local shore, 226. 
— ground, 41, 226. 
— houses, natural, 253. 
— age of its formation according to 
observation, 298. 
Icebergs, 222, 223, 226. 
— glaciers, 226-227. 
Iceland spar, 578. 
Idocrase, 467, 578. 
Illinois, coal field of, 3. 
Imitative forms of calcareous alluvions, 
80. 
Increase of alluvial depositions, 5, 9. 
Indiana, coal field of, 3 
Inertia of the ocean, 632. 
— solid surface of the earth, 632. 
Infusoria, 48-77, 238-245. 
— iron ore, 564, 565, 575. 
— size of, 77.- 
