766 



INDEX. 



Trap Rocks, intrusive or posterior, in the coal measures, 109, 



124, 137, 403, 421, 497. 

 , in the Old Red Sandstone, 



184 et seq. 



— , in the Silurian Rocks, 225 



—235, 273—277, 287—294, 317—320, 327 et seq., 363 



et seq., 461 et seq., 457 et seq., 496 et seq. 

 ■ , in the Cambrian Rocks, 



258 et seq., 343 et seq., 404 et seq. 

 - , difficulty of determining their 



age, 75. 



Trappean conglomerates of New Red System, 51, 67. 

 Travertine, formation of, 565. 



Trecastle, Brecknockshire, Old Red Sandstone, 182, 720. 

 Treen coal-pits, Glee Hills, 112—114, 126, 127. 

 Treflach hills, near Oswestry, 141, 142. 



wood, near Oswestry, Carboniferous Limestone, 145. 



Trefonen, near Oswestry, 141, 145, 146. 



Trefnant, Montgomeryshire, fossils at, 620. 



Tre-gib, Caennarthenshire, Caradoc Sandstone, 354. 



Trescot, near Wolverhampton, granite bowlders abundant, 535. 



Trevod, west of Knighton, flag stones of Lower Ludlow Rock, 31 5. 



Trewerne Hills on the Wye, Ludlow Rocks, 312. 



, fossil shells of, 609 et seq. 



Tri-chriig, Caerniarthenshire, Old Red Sandstone, and Upper 



Silurian Rocks, 181, 349. 

 Trias, German group of New Red Sandstone, xxviii. 

 Trifleton, Pembrokeshire, Cambrian flagstones, 399. 

 Trilobites, general view and geological range of, 645 et seg. 



■ of Upper Ludlow Rock, 200, 300, 651 et seq. 



of Aymestry Limestone, 653, 655. 



of Lower Ludlow Rock, 206, 302, 653. 



of Wenlock limestone, 215, 651—658. 



of Caradoc Sandstone, 303, 659 et seq. 



of Llandeilo Flags, 279, 307, 662 et seq. 



structure and affinities of, 660 et seq. 



Trimmer, Mr. Joshua, his observations on sea-shells and gravel, 



528, 531, 532, 534. 

 Trinucleus, genus of Crustaceans, 650, 659 et seq. 

 Tropical regions destitute of erratic blocks, 541, 543. 

 Trostry, Monmouthshire, Ludlow Rocks and gravel, 438, 441. 

 Trysull, near Wolverhampton, granite bowlders abundant at, 535. 

 Tufker Rock, Pembrokeshire, trap, 405. 

 Turbaries, formation of, 559. 



Turl's Hill, near Sedgeley, Aymestry limestone (PI. 37. f. 4.), 



481, 487, 725. 



Turner, Dr. Edward, analysis of vein stone, 368. 



Turner's Hill, near Dudley, Ludlow Rocks (PI. 37. f. 2.), 480, 



482, 725. 



■ , fossils at, 618. 



Tynewidd, Caermarthenshire, Silurian fossils, 349, 624, 629 et 

 seq., 637. 



Tyrolese Alps, bowlders from (wood-cut), 544. 

 Tytherington, Gloucestershire, carboniferous limestone, 452. 

 Twrch-fechan stream, Caermarthenshire, transverse fault, 165. 



Uffmgton, near Shrewsbury, coal and freshwater limestone, 

 62, 92, 94. 



Uffington, near Shrewsbury, section at (PI. 29. f. 6.), 713. 

 Uniformity of mineral character over large areas, 573. 



of zoological characters over large areas, 583. 



Upper lias shale. See Lias. 



Ludlow Rock, a few fossils common to it and base of Old 



Red Sandstone, 585. 



Upper Ludlow Rock. See Ludlow Rock. 



New Red Sandstone (Bunter Sandstein), 36. 



■ , organic remains of, 43, 64. 



Silurian Rocks, fishes of, 605. 



; , shells of, 608—633. 



, trilobites of, 651 et seq. 



, corals of, 214. 



Upton Bishop, axis of Woolhope to, 442. 



Usk to Chepstow, section (PL 36. f. 24.), 159, 160, 724. 



, river and valley, Old Red Sandstone of, 162, 164,170, 176. 



, Silurian group of (PI. 36. f. 23.), 438, 439, 724. 



, fossils of, 440, 569, 610 et seq. 



« , valley of, local drift in, 516 — 518. 



, vale of, torrential action on sides of, 561. 



Vale of Gloucester, rocks of sedimentary origin, 21. 



, mineral springs, origin of, 35, 36. 



of Meifod, ridges of Caradoc sandstone, 306. 



of Montgomery, trap rocks of, 287, 288. 



of Worcester, 533, 557. 



of Severn, 532 et seq. 



Valenciennes, coal-plants of, 85. 



, M., on fossil fishes, 601. 



Valens Manlius defeated by the Silures, xxxi. 



Valley of elevation of Wigmore Lake (PI. 31. f. 5.), 238, 549, 716. 



■ of Woolhope (PI. 36. f. 9.), Map and wood- 



cut, 196, 427, 723. 



1 of Usk (PI. 36. f. 23.), 438, 517, 724. 



: of the Wren's Nest (wood-cuts), (PI. 37. f. 1 



et seq.), 486, 725. 



Vasta Regalia, or " Royal Forest," 560. 



Vegetable matter carried by rivers into the sea, 149. 



Veins metalliferous. See Mines. 



Veins of Quartz in New Red Sandstone, 41. 



Vein "warm water vein" Shelve, 280, 732. 



Venetz, M., on Glaciers and " Moraines," 538. 



Veranius combats the Silures, xxxi. 



Verneuil, M. de, oil Silurian Rocks, 7. 



Vespasian, Silures finally conquered in the reign of, xxxi. 



Vesuvius, lava currents of, 69, 70, 73. 



View Edge, Salop, Aymestry Limestone and fossils, 201, 203,615. 



Views or Sketches (lithographic), list of, xxi. 



Voel, Breidden Hills, greenstone of, 291. 



Volcanic eruptions, different ages of, 571. 



Volcanic Grit, definition of. See Trap Rocks bedded. 



Rocks. See Trap Rocks. 



Volcanos, extinct, 69. 



• , submarine, 71, 230, 269, 319, 324, 461, 468. 



Voltz, M., on plants of the Keuper, 30. 



, on the Keuper and Gres Bigarre of Alsace, 33, 44. 



Wahlenberg, M., on fossil shells and trilobites, 620, 646. 

 "Walcot Park, Salop, Ludlow Rocks, 300. 

 Walker's Earth, or Walker's soap (Fuller's Earth), 204, 439. 

 Walker, Mr., on the produce of the Bog lead mines, 280, 730. 

 Wallsall, New Tied Sandstone, Coal Measures and Wenlock 



Limestone (PI. 37. f. 3.), 42, 464, 473, 488, 503, 725. 



fossils of Wenlock Limestone, 624 et seq. 



Walsgrove Hill, Worcestershire, Ludlow Rocks and fossils, 53, 



412, 420, 614 et seq. 

 Walwin's Castle, Pembrokeshire, dyke of compact felspar, 403. 

 Warburton, Mr. on the dolomitic conglomerate, 46, 450, 451. 

 Warshill, near Kidderminster, New Red Sandstone and trap, 



54, 138, 178. 



