INDEX. 



763 



Silurian region, ancient boundaries of, xxxi. 



, condition in former geological epochs, 97. 



— System, general observations on, 1 — 12, 195, 568 et 



seq., 579 et seq. 



- , general section of, 196. 



Rocks, sections of (PI. 31. et seq.), 716 et seq. 



, dislocations of, 231, 236, 312, 337, 355—359, 



420 et seq., 431, 445, 461, 489. 

 , jointed structure of, 201, 205, 243, 307, 339, 



411, 455, 491, 495. 



, landslips of, 248 et seq., 434. 



, wells in, 250. 



, mineral springs of, 241, 252, 261, 327, 329, 332, 



334. 



, agricultural character of, 252. 



support the Staffordshire coal-field, 489. 



System, Upper (PI. 31. f. 2 et seq.), 196, 300, 336, 348, 



390, 409, 480, 717. 



, Upper Ludlow Rock, 197, 300, 311, 337, 



. 348, 410, 430, 438, 454, 481. 

 , Aymestry limestone, 201, 231, 410, 430, 



442, 454, 481. 



, Lower Ludlow Rock, 204, 301, 311, 



430, 439, 454, 482. 

 , Wenlock Limestone, 208, 313, 349, 



412, 429, 440, 455, 483. 



, Wenlock Shale, 212, 423, 440, 484. 



, Lower (PI. 31. f. 3, 4. PI. 32. f. 9.), 216, 302, 



314, 341, 350, 393. 



, Caradoc sandstone, 216, 303, 350, 393, 



414, 429, 440, 443, 456, 494. 



, Llandeilo flags (PI. 34, 35.), 222, 270, 



307, 352, 355, 394. 



, fossils of, distinct from those of the carbonife- 

 rous system, 581 et seq. See Organic Remains. 



Silver Hill, North Stafford coal-field, fossil fishes, 475. 



Sitch Wood, Ledbury, fossils at, 618. 



Skin-id mountain, Old Red Sandstone, 173, 176, 179. 



Skomer Island, Pembrokeshire (wood-cut), (PI. 35. f. 10.), 389, 

 404, 722. 



Skrinkle Bay, Pembroke, beds of lower limestone shale, 384. 

 Skye, Isle of, pyramidal masses of trap, 499. 

 Slashes, or heaps of broken culm in Pembrokeshire, 376. 

 Slaty cleavage. See Cleavage. 

 Slebech, Pembrokeshire (PI. 35. f. 3.), 372, 721. 

 Slickensides, or the polished surfaces of faults, 147. 

 Smerwick Harbour, Ireland, Silurian fossils, 581. 

 Smethwick, Birmingham, Lower New Red Sandstone sunk into, 

 469. 



Smith, Mr. W., strata identified by organic remains, 3, 13. 



, names formations after places, 195. 



, Dr., Oolitic and Silurian fossils from SouthAfrica, 8, 583. 



, Mr., of Jordan Hill, on the raised beaches of Scotland, 



546. 



, Mr. Thomas, Miner's Guide, 469, 477. 



, Sir Edward, Bart., 221. 



Smyth, Capt., R.N., on Graham Island, 71, 230. 

 Snailbatch, lead mines, Salop, 280, 285, 293, 730. 

 Snead, Montgomeryshire, 269. 



Sneads Heath, Lower Lickey, quartz rock, 493, 494, 495. 

 Snowdon, &c, porphyries of, 345. 

 , fossil shells of, 639. 



Sollershope, Herefordshire, rivulet and gorge of, 432, 433. 



Soudley, Caradoc sandstone and shelly flagstones, 218, 219. 



, fossils at, 636 et seq. 



South America, modern submarine deposits similar to those in 



central counties of England, 533. 



, bowlders transported in icebergs, 543. 



Pembroke, trap rocks of, 403, 405, 406. 



, confluence of divergent lines of strike, 406. 



■ , east and west axis of, 407, 408. 



Sphagodus, fossil fish in Upper Ludlow Rock, 605, 606. 

 Spread Eagle Pill, Pembrokeshire, band of Silurian Rocks, 395. 

 Squilfa Hill, Salop, greenstone and volcanic grit, 276, 277. 



vein, Shelve lead mines, Salop, 278. 



South Shropshire, local detritus of, 510. 



South Wales, Old Red Sandstone surrounds coal basin, 174. 



, gravel on three sides of the coal basin, 517. 



South Welsh coal-field (section from), 80,85,155—168,407, 



441. 



, major axis of, 571. 



, sections from the edge of (PI. 31. f. 1. 



PI. 34. f.5— 9.), 176—348, 716, 720. 



, torrential river action on edges of, 561. 



South Worcestershire, southern tracts of void of coal, 155, 158. 

 Southern Africa, Silurian organic remains, 583. 



hemisphere, ice-floes of, 541. 



, Mr. C. Darwin on the climate of, 542. 



Southstone Rock, Worcestershire, travertine, 565, 566, 567. 

 Sowdde river traverses Old Red and Silurian strata (PI. 34. 



f.5.), 175, 348, 354, 720. 



, active course of, 561. 



Sowerby, Mr. J. de C, fossils of Shrewsbury coal-field, 86. 



, Mineral Conchology, 104 et passim. 



, fossils of Carboniferous Limestone, 161, 



384. 



— , recent sea shells identified by him, 533. 



, on Himalayan fossils, 583. 



■ , on the fossil shells of the Old Red Sand- 

 stone, 602 et seq. 



, on the fossil shells of the Silurian 



System, 608—644. 



Springs. See Mineral Springs. 



Stackpole Court, Pembrokeshire, 521. 



promontory, blown sands at, 562. 



, carboniferous limestone shale, 161, 378, 382, 384. 



Staffordshire, New Red Sandstone, 36. 



, Lower New Red Sandstone, 62, 132. 



( South coal-field of, 76, 98, 275, 463, 508. 



, sections of (PI. 29. f. 10, 13. and PI. 37.), 714, 723. 



-, North (Newcastle-under-Lyne), organic remains 



compared and identified, 474. 



, Silurian Rocks beneath the coal-field of, 480. 



, lines of fissure through, 504. 



, when submerged, and gravel of, 524, 525, 528. 



, modern marine shells found on the hills of, 534. 



North, line of elevation of New Red Sandstone 



proceeding from the Breidden Hills, 570. 



Stagbury Hill, near Bewdley, red conglomerate, coal and trap, 

 54, 134, 139. 



Stand Hills, near Dudley, Lower New Red Sandstone, and 

 faults near, 57, 501, 504. 



, Barrow Hill fault, 500, 504. 



Standard quarries, Welch Pool, trap and wood-cut, 289. 



Stanley, Rev. Edward (now Bishop of Norwich), on caves con- 

 taining bones of extinct quadrupeds, 552, 553. 



