INDEX, 
A. 
Aboriginal names, pages 146, 219, 225, 406. 
Absence of an acknowledged basis at the west, and difficul¬ 
ties arising therefrom, 513. 
Accretions, 41, 42/ 
Achmite, 99. 
Acid springs, 134, 464. 
Acroculia, 172. 
Action of freezing water in deepening river channels, 375. 
Action of the ocean upon rocky shores, 322. 
Agassiz, Prof., his theory, 330. 
Agnostus latus, 72; its lowest position, 74. 
Agricultural characters of the soil overlying the Medina 
sandstone, 45; Niagara group, 99; Onondaga-salt group, 
136; Corniferous limestone, 170; Marcellus shale, 179; 
Hamilton group, 195, 210 ; Portage group, 239; Chemung 
group, 260. 
Aikin, Prof., survey of Coal district in Maryland, 23. 
Akron, Ohio, rocks at, 502. 
Alexander, J. H. Esq. and Prof. Ducatel, geological and 
topographical survey of Maryland, 23. 
Allegany county, surface, rocks, elevation, etc. 484. 
Alluvium, 472, 489. 
Alumina, sulphate, 98, 260. 
American stag, 365. 
Analogy between the Hamilton group and shale of the Nia¬ 
gara group, 185. 
Ancient condition of the continent during the transport of 
boulders, 337 ; and during the formation of terraces, 352. 
Ancient valley of the Genesee, now filled with drift, 372, 
Anculotus, 397. 
Angular and unworn boulders, 333. 
Anhydrite, 98. 
Anthracite coal, its lowest position, 28. 
Anticlinal axis in Western Ohio, extent and effects of, 513. 
Apulia, shale near, 184. 
Argillaceous iron ore, see Iron ore. 
Asaphus, 101. 
Astarte, 245. 
Astrea, 159. 
Atrypa, 29, 71, 72. 108, 137, 142, 148, 149, 171, 175, 180, 
198, 200, 202, 215, 216, 222, 255, 271, 276, 456, 462, 
467, 472, 485. 
Avicula, 29, 30, 76, 108, 137, 142, 180, 202, 203, 222, 229, 
243, 255, 256, 262, 263, 264, 461, 465, 473, 481, 486, 494. 
Avon sulphur springs, 313. 
( Geol. 4th Dist.] 
is. 
Baryta, sulphate, 44, 65, 67, 141, 179, 194, 214, 221,239. 
Bayfield, Capt., his observations on the St. Lawrence, 335. 
Bays or ponds of Lake Ontario, 55, 417. 
Beaches and sandbars, removal of, 409. 
Beaches, observations on ancient, 353. 
Beaches, modern, and lake ridges, 354. 
Bear lake, 407. 
Beck, Dr. L. C. & A. Eaton, agricultural survey of Rens¬ 
selaer county, 6. 
Beck, Dr. T. R. & A. Eaton, agricultural survey of Albany 
county, 6. 
Bellerophon, 29, 48, 196, 229, 243, 245. 
Birdseye limestone, 28. 
Bitumen, 177, 221, 257, 310. 
Bituminous limestone, 84, 85; sandstone, 310, 485. 
Black micaceous shale, 248, 485. 
Black-river limestone group (Birdseye and Chazy), 28 ; its 
extent in New-York, Canada, Kentucky, Pennsylvania 
and Virginia, 28. 
Black-Rock, 140. 
Black shale, 177; slate, 218 ; varieties of slaty shale, 230« 
Blende, 460. 
Blocks of Medina sandstone on Niagara limestone, 340. 
Bloody brook, gorge of, 398. 
Blue fluid in concretions of Genesee slate and Marcellus 
shale, 221. 
Blue limestone of Ohio, &c., identity with the Hudson-river 
group of New-York, 503, 504. 
Bog and argillaceous iron, 419. 
Bog iron ore, 140, 437, 447, 470, 491. 
Bones and scales of fishes in the Old Red sandstone, 280. 
Booth, Prof. W. C., geological survey of Delaware, 23. 
Boring for coal, 239; for brine, 45, 135, 417. 
Boulders, 319, 320; position and mode of transport of the 
northern, 332; means of transportation, 334 ; northern, not 
found in intertropical regions, 333 ; angular and rounded, 
333 ; rare in the higher groups, 333; position of the for¬ 
mation in relation to the ancient drift, 339. 
Boulders in Wayne county, 416; in Monroe county, 424; 
in Orleans, 437; in Niagara, 443; in Seneca, 453; in 
Cattaraugus, 491; of iron ore, 491 ; used for burning to 
lime, 496. 
Brachiopoda, 229. 
Briggs, Prof. C., report on the geology of Ohio, 23. 
84 
