890 



INDEX. 









Labrador current, 40, 203, 534, 

 562, 554, 669. 

 fiords in, 534. 

 Primordial in, 167. 

 terraces in, 550. 

 Labradorite, 54, § 74. 

 Labyrinthine structure of 



Ganoid teeth, 264* 333. 

 Labyrinthodon, 427 * 428. 

 Labyrinthodonts, 337, 333, § 

 349, 351, 427,§ 484, 598, 

 599. 

 a comprehensive type, 382. 

 in Triassic, 412. 

 last of, 484. 



range of, in time, 388* 589* 

 Laccolith, 824. 

 Laccopteris, 409. 

 Lacertians, 338, § 443, 484. 

 range of, in time, 388.* 

 Lacertilians, 510. 

 Lacustrine beds, 513, 544. 

 Lsekenian group, 513. 

 Lselaps, 464. § 

 Lagomys, 520. § 

 spelseus, 564. 

 Lagrange group, 493. 

 Lake-basins, formation of, 540, 



825. 

 Lake-border formations, 544. 

 Lake Champlain outlined, 215- 

 an arm of the sea in the 



Quaternary, 552. 

 terraces on, 550. 

 Lake Memphremagog, corals at, 



22-. 

 Lake, Salt. See Great Salt 



Lake. 

 Lake Superior Archaean, 150, 

 159. 

 copper, 184, 185. 

 Chazy, 183. 

 trap, 185. 

 sandstone. 376. 

 silver, 186. 

 Lake-dwe llin gs ,576. 

 Lakes, positions of, 22. 

 change of level in surface of, 



634. 

 bursting of 648. 

 elevations of, 23. 

 Tertiary, 491 

 the Great, of North America, 



origin of, 394, 825. 

 without outlets, usually salt, 

 23. 

 Lama, 568. 



Lamellibranchs, 125, § 253, § 

 342, 432. 

 culmination of, 483. 

 range of, in time, 387.* 

 Laminaria, ash of, 61, 611. 

 Laminarian zone, fill. 

 Laminated rocks, 63. § 

 structure, 82. § 

 structure, cause of, 791, 803. 

 structure of glaciers, produc- 

 tion of, 69'< .* 

 Lamination, oblique, of layers, 



82,* 83, 663, 684. 

 Lamna, 467, 475, 510. 

 acuminata, 477. 

 elegans, 262* 502 * 509, 618, 

 519. 

 Landenian group, 512. 

 Land affects climate, 712. 

 arrangement of, 10, 13. 

 below sea-level, 13, 14. 

 first, above water, 160. 



Land, mean height of, 14. 

 Land-plants. See Plaints. 

 Landscape-marble, 425. 

 Land snails, first of, in Carbo- 

 niferous, 332, 342. 

 Land-slides, 665. 

 Laornis, 468. 



Lapland, Primordial in, 179. 

 Laosaurus, 433. 

 Laramie Mts., Archaean in, 150. 



Jurassic in, 43 1. 



group, 454, 490, 493. 

 Lartet, E., on Amiens gravel, 

 576. 



on migrations, 572, 

 Larve, 592. 

 Laurel, 594, 609. 

 Lauren tian Period, 151. 

 Laurophyllum reticulatum, 



460. 

 Laurus, 497, 498, 514. 



obovata, 498. 



pedata, 493. 

 Lauzon group, 184. 

 Lava, 49, 79,§ 722,§ 727,§, 



736. 

 Lava-cones, 724.* 

 Layer, 81. § 



Layers, structure of, 82. § 

 Leader, 114. § 



Lead-mines in Illinois and Wis- 

 cousin, 197. 



in Missouri, 186. 



in New York, 222. 



in the Oneida, 222. 



in the Trenton, 207. 

 Leaf-beds, 512. 

 Leaia tricarinata, 342. 

 Lebanon limestone, 163. 

 Lebanon Mt., fishes of, 520. 

 Lecanocrinus elegans, 199,* 



203. 

 Leclaire limestone, 221. 

 LeConte, J. L.,on fossil Ephem- 

 era, 416. 

 LeConte, J., analysis of coal, 

 493. 



on mountain making, 835 

 Leda, 485. 



amygdaloides, 518. 



minuta. 553. 



mullilineata, 509. 



pernula, 553. 

 Leda clays, 550, 555. 

 Leech, 122. § 

 Leguminosites Marcouanus, 



459.* 

 Leidy. J., Bathygnathus, 417. 



publications of, 468. 



Tertiary Mammals, 506, 507. 

 Leiodon, 475. 



dyspelor, 468. 



proriger, 468. 

 Lemming, 571. 

 Lemuravus distans, 510. 

 Lemurs, 504, 505. 

 Lenticular iron-ore, 220. 

 Leopard. 564. 

 Leperditia, 180. 



alta, 239,* 240. 



amygdalina, 192. 



Anna, 188*189. 



Baltica, 230, 249. 



Canadensis, 192. 



concinnula, 190. 



cylindrica, 228. 



Fabulites, 202,* 204. 



Josephiana, 204. 



Solvensis, 180. 



Leperditia Trojensis, 178. 



ven trails, 190. 

 Lepidodendrids, 269, § 324, 325, 

 328, 351, 354, 356, 359, b62, 

 407. 

 a comprehensive type, 382. 

 Lepidodendron, 245, § .80, 296, 

 297, 307, 323,* 329, 331, 

 348, 349, 356. 

 aculeatum, 297, 324,* 329. 

 Chemungense, 278. 

 clypeatum,324,*329. 

 corrugatum, 297. 

 costatum, 297. 

 diplotegioides, 297. 

 forulatum, 297. 

 Gaspianum, 271, 278 

 obscurum, 297. 

 primfevum, 269,* 271. 

 Serlii, 349. 



Sternbergii, 297, 329. 

 tetragonum, 297. 

 turbinatum, 297. 

 Veltheimianum, 283, 297. 

 Worthianum, 297. 

 Lepidomelane, 54. § 

 Lepidophloios, 348. 

 Lepidophyllum, 348. 

 Lepidostrobus, 297, 329, 348. 

 Lepidopteris Stuttgartensis, 



407 * 409. 

 Lepidosteus, 61, 264,§* 501, 

 519. 

 glaber, 510. 

 osseus, 264.* 

 Whitney i, 510 

 Lepidotus, 475, 508. 



Fittoni, 450. 

 Leptacanthus, 275; 30*. 

 Leptama, 172,§* 189, 190, 199, 

 228, 249, 252, 437, 448, 

 597 

 depressa, 203.* 248. - 

 incrassata. 190. 

 Moorei, 438*448. 

 plicifera, 191* 

 rugosa, 200* 

 sericea, 200,* 203, 205, 206, 



207, 208, 209, 228. 

 transversalis, 208, 226 * 229, 



248. 

 last of, 437. 



range of, in time, 386.* 

 Leptarctus, 511. 



primus, 511. 

 Leptauchenia, 511. 

 Leptochoerus, 511. 

 Leptocoelia, 171. 

 concava, 243. 

 disparilis, 226* 229. 

 flabellites, 243. 

 Leptophleum rhombicum, 278 

 Lpptosolen Conradi, 468. 

 Leptynyte, 72 § 

 Lepus, 519, § 520. 

 Lescuropteris, 343. 

 Lesley, J. P., sections by, of 

 Coal-measures in Pennsyl- 

 vania, 311, 320, 396.* 

 axes of flexure in Pennsyl- 

 vania, 397.* 

 Coal and its Topography, 320. 

 Coal-measure iron -ores, 318. 

 fault at Chambersburg, Pa., 



399. 

 faults in southwestern Vir- 

 ginia, 399.* 400. 

 topographical effects of ero- 

 sion, 652. 



