652 
INDEX. 
Tabellaria, 49. 
Tables of angles, 549 - 558. 
— of boulders, 192, 193. 
~ of minerals, 521, 573, 577 - 579. 
— of drift scratches, 199. 
— of dip, 
— of angles for triangulating the 
country around West-Point, 549 
-558. 
Taconic system, 2, 383, 422 - 428. 
— rocks through the Highlands, 446 
-450. 
— age of, 626. 
Talc, 467, 579. 
Talco-argillaceous rocks, 433, 435 - 
438-441, 445. 
Talco-micaceous slate, 426. 
Talcose rocks, 423, 424 - 438. 
— slate, 426 - 438, 549. 
— metamorphic, 446 - 449. 
— of Rockland county, 448 - 449. 
Tangential force crushing strata, 631 - 
633. 
Tappan bay flats, 9. 
Temperature of .springs, 345, 349, 350. 
— Albany, 102. 
— New-Lebanon, 105. 
Tennessee, 2. 
Tentaculites, 345, 349, 350. 
Tentaculite limestone, 325. 
Tertiary system, 2, 246. 
— remarks on fossils by Mr. Conrad, 
277. 
Terraces of quaternary, 127, 152, 162. 
— Catskill division, 307. 
— Erie division (note), 321. 
Tessararthra, 51, 55. 
Tessella, 52, 75. 
Testacea, 326, 337, 338, 339, 342, 343, 
345, 349, 395. 
Textularia, 50. 
Theories of erratic blocks, 214 - 216, 
248. 
Theoretical considerations, metamor¬ 
phic rocks east of the Highlands, 
463 - 464. 
— taconic rocks, 438. 
— white limestone of Warwick, 468 
-476. 
Thermal springs, 104. 
Thompson, W, 207. 
Throg’s neck beach, 27. 
Thylacium, 49. 
Titaniferous iron ore, 514, 565, 574. 
Titanium, oxide of, 413, 438, 513. 
— silico-calcareous oxide of, 465,532. 
Topographical features of the Catskill 
division, 313. 
— drift, 160. 
— quaternary, 148- 157. 
— Hudson slate, 368. 
Torrey, Dr. 181, 515. 
Towns and villages located on the qua¬ 
ternary, 128. 
Tracks of wheels under drifted sands, 
233. 
Transportation of alluvia by means of 
ice, 39, 40, 42. 
— waves, 24. 
Transition greywacke, 367. 
— limestone, 367. 
Transverse axes of disturbance, 320, 
452, 516, 637 (Vide axes). 
— stratification, 452, 453, 454, 543, 
Trappean system, 2. 
— age of, 246, 627. 
— division, 246, 248, 278. 
— dykes, 279, 282, 283, 449, 477, 
479, 533, 540. 
— rocks, characters and extent, 278. 
— origin of, 283. 
— injections, 281. 
— interlaminations, 479. 
— granite, 449. 
Tremolite, 450, 459, 462. 
Trenton limestone, 2, 367, 397 - 402. 
Triarthus, 390. 
Trilobites, 333, 390, 395, 397. 
Trocholites, 390, 395. 
Trout, 308, 312. 
Troy land-slips, 33 - 35. 
Tubipora, 350. 
Tufa, 80 - 82. 
— earthy of Schoharie, 80. 
Tufaceous marl, 80 - 82. 
Tully limestone, 317, 323. 
Tunnel on New-York island, 593. 
Turf, 10, 14 - 16, 229, 231, 232. 
— origin of, 12, 229 - 232. 
Twelve-mile marsh of Lake Cham¬ 
plain, 6. 
IT. 
Ulster lead mine, 359. 
Unconforraable stratification. Long 
island, 249. 
— Helderberg limestone and Hudson 
slate, 351, 368, 374, 384. 
Upheaved strata of the Calciferous 
group, 414 (Vide also axes, dis¬ 
turbed, broken, contorted, etc.). 
Utica slate, 367, 390 - 397. 
Valley of elevation, 637, 638. 
Valleys of Long island, 271- 
Valleys in the quaternary, how formed, 
147. 
— Taconic system, transverse, 427, 
430. 
Vanuxem, 129, 152, 325. 
Variation of compass, 117. 
Veins of trap, 2. 
— calc-spar in slate rocks of Hudson 
river, 387. 
— in joints of Helderberg lime¬ 
stone, 333. 
taconic rocks, 431. 
— granite, 439, 466, 516 - 520, 536, 
543, 547, 584, 586 - 604. 
— hornblende, 458. 
— lead ore, 358, 362. 
— quartz, 358 - 362, 385, 386, 387, 
392, 424, 427, 430, 431, 432, 
433, 437, 439, 466, 546. 
— cross the strata obliquely some¬ 
times, 359. 
— may be confounded with beds, 359. 
— metalliferous, 358 - 362, 484, 505. 
— in slaty rocks, Champlain division, 
332. 
— of magnetic oxide of iron, 484, 
559, 560, 561, 562, 563, 565, 
576. 
Velocity of rotation of the earth, 217, 
221, 227. 
Verd-antique, 463, 478, 481, 560. 
Virginia, 2. 
W. 
Wabash valley coal, 3. 
Wacke slate, 367. 
Wadd, earthy oxide of manganese, 
121 . 
Wading river marshes, 18. 
Waggon’s island flats (alluvial), 9. 
Wappinger’s creek delta, 8. 
Warwickite, 467, 579. 
— primary of, 3. 
Warwick limestone, 367. 
Washington county. 
Washing tables, 361. 
