INDEX. 
667 
Concretions or septaria, in Hamilton group, 193 ; in Gene¬ 
see slate, 220; in Portage group, 230. 
Concretionary structure, 214, 257; limestone, 480; sand¬ 
stone, 227, 48G. 
Conditions of deposition of the Hamilton, Portage and 
Chemung groups, 254. 
Conditions of the ocean and continents during the accumula¬ 
tion of the older sedimentary deposits, 521. 
Cone in cone, 232. 
Conesus lake, 198, 405, 407. 
Conglomerate, equivalent of the Millstone grit of England, 
284; diagonal lamination, 286; concretions and seams of 
iron ore, 287, 2S8; localities, 289; thickness, 291 ; or¬ 
ganic remains, 291, 502; position regarding the coal 
measures of Ohio, 292; associated with the Coal series, 
292; local details of, 481, 486, 467, 488, 491, 494, 495, 
501, 502. 
Connexion of lithological character with features of surface 
and soil, 14, 15. 
Conrad, Mr., his views of subdivision in the New-York 
rocks, 24. 
Continuation of species through successive formations, 10. 
Contorted strata, 85, 86 ; seams of iron ore, 290. 
Conularia, 110. 
Copper pyrites, 44, 67; carbonate, 44, 67, 98. 
Corals, 156, 4C0, 466. 
Coral resembling Isis, 116. 
Corniferous limestone, as aline of subdivision, 25; its 
extent as a rock, etc. 161; faults in, 163, 450; character 
of the strata, 166 ; localities, 167 ; thickness, 168 ; mineral 
contents of, 168; springs in, 168; fissures in, 169; agri¬ 
cultural characters of, 170; organic remains, 170; local 
details, 450, 456, 460, 466, 471, 503. 
Cornulites, 109, 137. 
Corydalis 451. 
Cotting, Dr., survey of Georgia, 23. 
Cranberry swamp, 416. 
Crinoidal columns, 71, 77, 90, 151, 204. 
Crinoidea, 65, 260, 466, 471, 486. 
Crooked lake, 406. 
Crusoe island and lake, 416. 
Cryphteus, 200, 462. 
Crystalline matter filling cracks in septaria, 193. 
Cucullea, 196. 
Current from north to south, 335 ; from south to north, 397. 
Currents, evidences of, 320, 323, 397 ; polar, in ancient 
ocean, 335. 
Curved strata, see Concretions. 
Curving joints, 305. 
Cyathocrinites, 111,247. 
Cyathophyllum, 160, 462, 467. 
Cyclas, 361, 396, 479. 
Cyprieardia, 29, 30, 48, 76, 196, 256, 291, 481. 
Cyrtoceras, £9. 175. 
Cysliphyllurn, 209. 
Cytherina, 142, 421. 
!>. 
Dams, effects of artificial, 376. 
Dark slaty fossiliferous shales, 184, 187. 
Dark and green argillaceous shales, 230. 
Darwin, Mr., his observations on climate, etc. in the southern 
ocean, applied to explain the transportation of boulders, 
335. 
Deep drift in Erie county, 469. 
Delthyris, 29, 70, 105, 137, 142, 148, 149, 171, 198, 200, 
202, 205, 207, 208, 229, 245, 255, 256, 259, 269, 270, 
276, 456, 467, 472, 481, 483, 485, 486, 494. 
Delthyris shaly limestone, 117, 144. 
Deluge, universal, 339. 
Dentaria, 451. 
Detritus, superficial, 318 ; its origin, 321; its distribution, 
319; local, 342. 
Dewey, Prof. C., discovery of native copper in limestone of 
Clinton group, 67. 
Devonian system, its equivalent in New-York, 20, 277. 
Diagonal and curved lamination, 40, 41, 230, 234, 256, 286, 
290, 324. 
Differences between strata of Europe and America of the 
same age, 8, 9. 
Different species inhabiting different parts of the ocean, 186. 
Diluvium, 318. 
Dip of rocks of the Portage group, 239 ; of rocks along the 
Niagara river, 387 ; of strata, 296. 
Dipleura, 205. 
Direction of grooves, 327; of ripplemarkings, 49. 
Disappearance of streams, 169. 
Discoloration of sands and clays from percolating water, 
1G3, 361. 
Distinctions between the Hamilton find Chemung groups, 
276. 
Distribution of boulders, 332. 
Dogtooth spar, 86, 92, 98, 168, 
Drab limestone, 119. 
Drainage of Lake Erie, 400. 
Drift, 46, 126, 179, 318, 482. 
Drift hills of Momoe county, 423, 
Drift deposit at Lewiston, 441. 
Drift and boulder formations, their relative age, 338. 
Ducatel, Prof. & J H. Alexander, geological and topogra¬ 
phical survey of Maryland, 23. 
Dudley limestone, its equivalent, 81. 
Dunkirk harbor, 329. 
E. 
Eaton. Prof. A., his survey of the New-York rocks, 5; his 
opinion of the age of the same rocks, 5, 6 ; his index to the 
geology of the Northern States, 6; agricultural survey of 
Albany and Rensselaer counties, 6; section of the rocks 
from Lewiston to Lake Erie, 395. 
Effect of woodlands on springs, 239; of winds on lake levels, 
410. 
Efflorescences, 98, 312. 
