INDEX. 
669 
Geological labors in America to identify rocks with those of 
Europe, 5. 
Geological formations of Europe and America, cause of dif¬ 
ficulty in attempting to harmonize the arrangement in the 
two countries, 8. 
Geological position of the lead ores of Wisconsin, Illinois 
and Iowa, 512. 
Geological examinations in Maine and Massachusetts, 22; 
in Connecticut, New-Jersey, Pennsylvania, Virginia, 
Maryland, Delaware, Ohio, Michigan, Indiana, Illinois, 
Wisconsin, Iowa, Tennessee, Georgia, North and South 
Carolina, 23. 
Geological position of the western lakes of New-York, 406; 
of Lake Ontario and Lake Erie, 408. 
Glaciers, 330, 334. 
Goat island, 97, 347, 395, 396. 
Goniatites, 229, 243, 245. 
Gorge of the Niagara river, 388 ; from the Whirlpool to St. 
David’s, 389; of Bloody run, 396, 398; of Wolf creek, 
374; of Canaserowlie creek, 380, 
Gorgonia, 115. 
Grand island, 127. 
Graptolites, 29, 30, 72. 
Gravel (see Drift), 319, 474. 
Grazing lands, 240, 261, 294. 
Great lakes, relative elevation of, 384 ; elevation and de¬ 
pression of water in, 408. 
Green bands and spots in Medina sandstone, 38, 117, 120. 
Green marl, 119, 120. 
Green varieties of shale increasing west of Genesee river, 
253. 
Green varieties of shale not slaty, 230. 
Greenish grey argillaceous or siliceous sandstone, 39. 
Greentown in Ohio, coal beds and associated limestone, 502. 
Grey quartzose sandstone, 37. 
Grey sandstone and Oneida conglomerate, 31. 
Grey sparry limerock, 151. 
Greywacke, 117, 177, 184. 
Grindstones, 483, 585, 495, 497. 
Grit, Schoharie, 151; Cauda-galli, 150. 
Grit slate of Eaton, 151. 
Grooved, striated and polished rocks, 325; on Lake Erie 
shore, 328 ; surface of limestone in Clinton group, 329. 
Groove 100 feet long at Lockport, 327. 
Grooves, direction of, 325, 327 ; remarks on the theories 
regarding, 330. 
Groups of the Fourth district, 32; below the same, 26. 
Gypseous marls and slates,.. 117, 120, 418, 426, 449, 453, 
464 ; rocks used as marl, 429. 
Gypsum, 98, 120, 121, 122, 123, 124, 125, 421, 430, 449, 
450, 453, 454, 455, 457, 460, 465, 469, 480. 
SI. 
Hamilton group, general characters, 185 ; subdivisions, 187 ; 
extent, 188, 189; jointed structure or vertical cleavage, 
192; concretions or septaria, 193 ; localities, 193; thick¬ 
ness, 194 ; mineral contents and springs, 194 ; agricultural 
[Geol. 4th Dist.] 
characters, 194 ; organic lemains, 195 ; localities of super¬ 
position, 211 ; local details of, 451,457, 458,462, 467, 503. 
Hardpan reclaimed by manuring, 468. 
Hayes, Mr., his speculations regarding Niagara falls, 395. 
Hearthstones, 483. 
Hector falls, 379, 476. 
Helderberg group, 144. 
Helix, 437, 479. 
Ilemicrypturus, 77. 
Hemlock lake, 407. 
Hennepin, Father Louis, account of Niagara falls, 394. 
Hildreth, Dr., papers on the geology of Ohio, 23. 
Hipparionyx, 149. 
Hitchcock, Prof., survey of Massachusetts, 22. 
Iloloptychus, 281, 282, 482. 
Homalonotus, 103. 
Honeoye lake, 407. 
Hopper hills, 194. 
Hopper-shaped crystals and cavities, 127, 128. 
Horizontal position of strata considered an indication of 
more recent age of rocks, 9. 
Hornstone, 63, 67, 87, 162, 165, 168, 471. 
Houghton, Dr. D., geological survey of Michigan, 23. 
Howard fiats, 482. 
Hudson river group, 30; identity of the Blue limestone of 
Ohio with, 503, 504. 
Hydraulic cement, 142, 431, 447, 455, 4S0. 
Hydraulic lime, 84, 85, 88, 128 - 130, 182, 143, 147, 424, 
438, 455, 465, 470, 471. 
Hydraulic limestone, transported blocks of, 341. 
Hydrosulphuretted springs, 427. 
Hypanthocrinites, 113. 
Hypogene or Primary system, 17. 
a. 
Icebergs and floes, see Glaciers. 
Ichthyodorulite, 174, 175, 456. 
Identity of the rock formations of New-York with those of 
the Western States, 500; with those of Europe, 516/ 
Identity of strata in Russia, Siberia, Sweden, Norway, 
Canada, &c. 21. 
Illasnus, 29. 
Inachus, 29. 
Increase of calcareous and diminution of sedimentary matter 
in a westerly direction, 515. 
Index to the geology of the Northern States (Eaton’s), 6. 
Iodine in brine springs, 315. 
Iron ore, 486 ; bog and argillaceous, 140, 419, 437, 447, 470, 
491; boulders of, 491; concentric seams of, 288 ; fossili- 
ferous, 60. 
Iron, native, 459 ; sulphate, 260, 312 ; sulphuret, 44, 64, 67, 
81, 98, 99, 157, 179, 239, 296, 297, 479, 480, 483; oxide, 
64; hydrated peroxide, 44, 287. 
Iron pyrites, see Sulphuret of iron. 
Iron pyrites replacing fossils, 182, 189, 192, 193, 260. 
Iron pyrites mistaken for silver, 669. 
Iron sand, 476. 
85 
