636 
INDEX. 
SABLES. 
Sables de Brachenx, 276. 
-moyeiis, Paris basin, 273. 
Sahlite, 502. 
St. Abb’s Head, curved strata of, 76. 
-, unconformable stratilicatiou at, 94. 
St. Andrews, carboniferous trap-rocks of, 
545. 
St. Cassian, fossil mollusca of, 377. 
-and Hallstadt beds, 376. 
St. David’s, Menevian beds of, 485. 
St. Mary’s, shells of, 539. 
Salt, rock, origin of, 372. 
Salter, Mr., on fossils of Arenig group, 476. 
-, on Menevian beds, 485. 
-, on Tremadoc fossils, 483. 
Sandberger, Dr. F., on Mayence basin, 
242. 
Sandstone, New Red, 369. 
-, Old Red, 439. 
-slab with cracks, 317. 
-, slab of ripple-marked, 45. 
-slab with foot-prints, 408, 
Sao hirsuta, 488. 
Saurians of the Lias, 361. 
——, sudden destruction of, 362. 
Saurichthys apicalin, Rhcetic Beds, 367. 
Saussure, on vertical conglomerates, 73. 
Saxicava rugosa, Scotch drift, 176. 
Saxony, beds of minerals in, 609. 
Scandinavia, glaciation of, 174. 
Scaphites cequalis, Chloritic marl, 299. 
Scapolite, 506. 
Scheerer on action of water in metamor¬ 
phism, 585. 
Schist, mica, 578. 
-, argillaceous, 579. 
-, hornblende, 578^ 
Schizoduff Schlotheimi, Permian, 387. 
- truncatus, Permian, 387. 
Schmerling, Dr., on Liege caverns, 157. 
Schorl-rock, and schorly granite, 557. 
Schwab, M., on Celtic coins in lake-dwell¬ 
ings, 149. 
Scoliostoma, St. Cassian, 377. 
Scoresby, on Arctic icebergs, 172. 
Scoriaceous lava, 507. 
Scoriae, 508. 
Scotland, “Fundamental gneiss” of, 493. 
-, Old Red Sandstone of, 440. 
-, glaciation of, 175. 
Screws, fossil, internal casts of shells, 66. 
Scrope, Mr., on Isle of Ponza, globiform 
pitchstone, 512. 
-, on minerals in lava, 524. 
-, on water in lava, 555. 
Scuclder, Mr., on Devonian insects of 
Canada, 457. 
Sea, apparent fall of, caused by rise of land, 
70. 
-, denuding power of the, 105. 
-, deep soundings in, 287. 
-, mean depth of the, 118. 
■-cliifs, inland, 103. 
Secondarv andTertiarv, gap between the, 
281. 
• -, term defined, 123. 
Section of Auvergne alluvium, 100. 
• - of carboniferous rocks, Lancashire, 
85. 
-- of chalk and greensand, 287. 
-- of crags near Woodbridge, Suffolk, 
198. 
SIIETLAXT). 
Section of cross-stratification, 42-44. 
-of curved strata of the Jura, 82, 
-of dirt-bed in Isle of Portland, 832. 
-of Forfarshire, showing curved strata, 
74. 
-of fossil tree, showing texture, 67. 
-of folded and denuded carboniferous 
beds. Nova Scotia, 418. 
-of the Oolitic strata, 322. 
-of Recent and Post-Pliocene alluvial 
deposits, 151. 
-showing creeps in coal-mines, 79. 
-of slaty cleavage, 589. 
-showing valleys of denudation, 98. 
-showing the Weald formation, 313. 
-of strata thinning out, 41. 
- of superimposed groups at Dundry 
Hill, 130. 
- of unconformable strata near Mons, 
95. 
Sections illustrating faults, 88,90,91. 
Sedgwick, Professor, on the Cambrian 
Group, 481, 482, 486. 
-, on classification of Arenig group, 
476. 
-, on Devonian series, 439,449. 
-, on position of the May-Hill beds, 
568. 
-, on protrusion of solid granite, 574. 
■-, on slaty cleavage, 588, 591. 
-, on garnet in altered rock, 515. 
-, on concretionary strncture, 63. 
Sediment, accumulation of, causing a shift¬ 
ing of the subterranean isothermals, 
117. 
Sedimentary beds of the Carboniferous, 
396. 
Selsea Bill, erratics at, 182. 
Senarmont on action of water in metamor¬ 
phism, 585. 
Sequoia Langsdorjii, 238. 
Serajihim,'*’ head of Ptervgotus anglicuSj 
446. 
Serapis, marine littoral deposits of, 146. 
Serpentine, 578. 
Serpulce attached to Gryphcea, 48. 
-attached to Spatangus, 49. 
-attached to Apiocrmus, 343. 
Shale defined, 36. 
-of the Lower Ludlow, 461. 
Sharpe, Mr. D., on American Silurian fos¬ 
sils, 479. 
-, on fossils distorted by cleavage, 592. 
Shell-mounds of Denmark, 146. 
Shells, arctic, in Scotch drift, 177. 
-, derivative, in the Crag, 195-203. 
-, marine, found at great heights above 
the sea, 29. 
-, proportion of living, in the Crags, 
194, 195,199. 
-, value of, in classification, 142. 
-, fossil, of Virginia, 228. 
-of the London clay, 266. 
-of the mountain limestone, 433. 
-of the Barton clay, 258. 
-of the Oolite, 335, 345, 350. 
-, marine, of Moel Tryfaen, 180. 
Sheppey, fanna and flora of, 264. 
-, Eocene fish of, 267. 
Sherringham, erratic block at, 191. 
Shetland, granite of, 558. 
-, hornblende-schist of, 583. 
