| FIG. | | PAGE |
| 176. | Section from the great Limestone escarpment on the west to
the Millstone Grit hills east of Teesdale | [4] |
| 177. | Sections of the Carboniferous Limestone series of Northumberland showing the variations in the position of the Whin Sill. By Messrs. Topley and Lebour | [6] |
| 178. | View of two volcanic necks in the Carboniferous Limestone series, at Grange Mill, five miles west of Matlock Bath, from the north | [14] |
| 179. | Plan of necks and bedded tuff at Grange Mill, five miles west of Matlock Bath | [15] |
| 180. | Section across the smaller volcanic neck and the stratified tuff in Carboniferous Limestone, Grange Mill | [15] |
| 181. | Section of vesicular and amygdaloidal diabase resting on Carboniferous Limestone, Peak Forest Limeworks, Great Rocks Quarry | [19] |
| 182. | View of the superposition of Carboniferous Limestone upon toadstone, Raven's Tor, Millersdale (length about 100 feet) | [19] |
| 183. | Section at lime-kiln, south of Viaduct, Millersdale Station | [20] |
| 184. | Limestones passing under stratified tuffs, Poyll Vaaish, Isle of Man | [24] |
| 185. | Section of tuff, showing intercalations of black impure chert, west of Closenychollagh Point, near Castletown, Isle of Man | [25] |
| 186. | Section of intercalated dark limestone, shale and chert in the tuff south of Poyll Vaaish Bay, Isle of Man | [26] |
| 187. | Section of part of a volcanic neck on shore to the south-east of Poyll Vaaish Bay, Isle of Man | [29] |
| 188. | Section of successive discharges and disturbances within a volcanic vent. Scarlet Point, Isle of Man | [29] |
| 189. | Section of dyke and sill in the tuffs west of Scarlet Point, Isle of Man | [30] |
| 190. | Section on south side of vesicular sill west of Scarlet Point | [31] |
| 191. | Bands of vesicles in the same sill | [31] |
| 192. | Croghan Hill, King's County, from S.S.W. | [38] |
| 193. | Section in quarry on roadside east of Limerick, close to viaduct of the Limerick and Erris Railway | [44] |
| 194. | Section of the volcanic escarpment, east of Shehan's Cross-roads, south of Limerick | [45] |
| 195. | View of Derk Hill, a volcanic neck on the south side of the Limerick basin | [47] |
| 196. | Section across the Limerick volcanic basin | [48] |
| 197. | Section of a bed of volcanic breccia in the Carboniferous Slate; White Bull Head, County Cork | [50] |
| 198. | Volcanic breccia invading and enclosing Carboniferous slate, White Bull Head | [50] |
| 199. | General section across the Permian basin of Ayrshire
| [59] |
| 200. | Section of lavas, east side of Mauchline Hill | [60] |
| 201. | Section of the top of the volcanic series near Eastside Cottage, Carron Water, Nithsdale | [60] |
| 202. | Section of two outliers of the Permian volcanic series at the foot of Windyhill Burn, Water of Ae, Dumfriesshire | [61] |
| 203. | The Green Hill, Waterside, Dalmellington, from the south; a tuff-neck of Permian age | [62] |
| 204. | Patna Hill from the Doon Bridge, Ayrshire; a tuff-neck of Permian age | [63] |
| 205. | Ground plans of Permian volcanic vents from the Ayrshire Coal-field. On the scale of six inches to a mile | [64] |
| 206. | Section of sills traversing the Permian volcanic series. River Ayr, Ballochmyle | [66] |
| 207. | Section showing the relations of the later rocks of Arthur Seat | [68] |
| 208. | Section in brooks between Bonny town and Baldastard, Largo | [70] |
| 209. | View of Largo Law from the east | [71] |
| 210. | View of small neck in Calciferous Sandstones, on the shore, three miles east from St. Andrews | [72] |
| 211. | Ground-plan of Permian volcanic vents | [73] |
| 212. | Small neck in Calciferous Sandstones a little east from the "Rock and Spindle," two and a half miles east from St. Andrews | [74] |
| 213. | Plan of volcanic necks at Kellie Law, East of Fife, on the scale of three inches to one mile | [75] |
| 214. | Plan of the craters in Volcanello, Lipari Islands | [75] |
| 215. | Section of the strata at the edge of the volcanic vent on the east side of Elie Harbour | [76] |
| 216. | Agglomerate of neck on shore at Ardross, two miles east from Elie | [77] |
| 217. | Ground-plan of volcanic neck, Elie Harbour, showing circular disposition of the stratification | [80] |
| 218. | Section across the great vent of Kincraig, Elie, on a true scale, vertical and horizontal, of six inches to a mile | [81] |
| 219. | Dyke in volcanic neck, on the beach, St. Monans | [82] |
| 220. | Section of part of crater rim, Island of Volcano | [83] |
| 221. | Dyke rising through the agglomerate of a volcanic vent; Kincraig, Elie | [84] |
| 222. | Radiating columnar dyke in the tuff of a volcanic vent. Rock and Spindle, two and a half miles east from St. Andrews | [86] |
| 223. | View of part of the shore front of the great vent at Kincraig, looking westward, with the columnar basalt in front | [88] |
| 224. | Plan of volcanic neck on beach near St. Monans | [89] |
| 225. | Columnar basalt in the neck of Kincraig, Elie, seen from the west | [90] |
| 226. | Section across Largo Law | [91] |
| 227. | Vein of "white-trap" cutting black carbonaceous shales, a little west from St. Monans Church | [92] |
| 228. | Section at Belvedere, S. W. of Exeter | [97] |
| 229. | Diagram to show the unconformability and overlap of the Permian rocks in the Crediton Valley | [97] |
| 230. | Section of the volcanic series at Kellerton, Devonshire | [98] |
| 231. | Section of agglomerate overlain with sandstone and andesite, Posbury, Crediton | [99] |
| 232. | Diagrammatic section across Titterstone Clee Hill | [102] |
| 233. | Dyke on the south-east coast of the Island of Mull | [119] |
| 234. | Fissure left by the weathering out of a dyke | [120] |
| 235. | Plan of basalt-veins with selvages of black basalt-glass, east side of Beinn Tighe, Isle of Eigg
| [126] |
| 236. | Arrangement of lines of amygdales in a dyke, Strathmore, Skye | [130] |
| 237. | Systems of joints in the dykes | [132] |
| 238. | Section of cylindrical vein or dyke, cutting the bedded lavas, east side of Fuglö, Faroe Islands | [133] |
| 239. | Joint-structures in the central vitreous portion of the Eskdale Dyke (B. N. Peach) | [133] |
| 240. | Microscopic structure of the vitreous part of the Eskdale Dyke | [136] |
| 241. | Section along the line of the Cleveland Dyke at Cliff Ridge, Guisbrough (G. Barrow), scale, 12 inches to 1 mile | [147] |
| 242. | Section along the course of the Cleveland Dyke, at the head of Lonsdale, Yorkshire (G. Barrow, in the Memoirs of the Geol. Survey, Geology of Cleveland, p. 61) | [148] |
| 243. | Section across the extreme upper limit of Cleveland Dyke, on the scale of 20 feet to one inch (Mr. G. Barrow) | [149] |
| 244. | Upper limit of Cleveland Dyke in quarry near Cockfield (after Mr. Teall) | [149] |
| 245. | Section along the course of the Cleveland Dyke across the Cross Fell escarpment (scale of one inch to one mile) | [150] |
| 246. | Branching portion of the great dyke near Hawick (length about one mile) | [153] |
| 247. | Branching dyke at foot of Glen Artney (length about four miles) | [153] |
| 248. | Basic veins traversing Secondary limestone and sandstone on the coast cliffs, Aidnamurchan | [155] |
| 249. | Section showing the connection of a Dyke with an Intrusive Sheet, Point of Suisnish, Skye | [156] |
| 250. | Section to show the connection of a Dyke with an Intrusive Sheet, Stirlingshire Coal-field | [157] |
| 251. | Intersection of dykes in bedded basalt, Calliach Point, Mull | [158] |
| 252. | Basalt veins traversing bedded dolerites, Kildonan, Eigg | [159] |
| 253. | Ground-plan of intersecting dykes in Lias limestone, Shore, Harrabol, East of Broadford, Skye | [159] |
| 254. | Compound dyke, Market Stance, Broadford, Skye | [162] |
| 255. | Section of coal rendered columnar by intrusive basalt, shore, Saltcoats, Ayrshire | [164] |
| 256. | Dolerite dyke with marginal bands of "white trap," in black shale, Lower Lias, Pabba | [166] |
| 257. | Map of the chief dykes between Lochs Ridden and Striven (C. T. Clough, Geological Survey, Sheet 29) | [170] |
| 258. | Basalt-veins traversing granophyre, St. Kilda | [173] |
| 259. | Section of scoriaceous and prismatic basalt, Camas Tharbernish, north shore of Canna Island | [187] |
| 260. | Banded amygdaloidal basalt showing layers of elongated and steeply inclined vesicles, Macleod's Maidens, Skye | [191] |
| 261. | Termination of basalt-beds, Carsaig, Mull | [193] |
| 262. | Breccia and blocks of mica-schist, quartzite, etc., lying between bedded basalts, Isle of Mull | [197] |
| 263. | Section of Knocklayd, an outlier of the Antrim basalt-plateau lying on Chalk | [202] |
| 264. | Diagram-Section of the Antrim Plateau | [203] |
| 265. | View Of Basalt escarpment, Giant's Causeway, with the Amphitheatre and Chimneys. (From a photograph by Mr. R. Welch) | [207] |
| 266. | Basalt-capping on the top of Ben Iadain, Morven | [209] |
| 266a. | View of the south side of Staffa, showing the bedded and columnar structure of the basalt
| [210] |
| 267. | View of Rum from the harbour of Canna | [216] |
| 268. | Section of the cliffs below Compass Hill, Isle of Canna | [218] |
| 269. | Lava cutting out conglomerate and shale. Shore below Canna House | [224] |
| 270. | Section of shales and tuffs, with a coniferous stump lying between two basalt-sheets, Cùl nam Marbh, Canna | [225] |
| 271. | Dùn Mòr, Sanday. (From a photograph by Miss Thom) | [226] |
| 272. | View of the Dùn Beag, Sanday, seen from the south. (From a Photograph by Miss Thom) | [230] |
| 273. | View of Dùn Beag, Sanday, from the north. The island of Rum in the distance. (From a Photograph by Miss Thom) | [231] |
| 274. | Section of eastern front of Dùn Beag | [232] |
| 275. | Enlarged section on the western side of Dùn Beag | [233] |
| 276. | Geological map of the Island of Eigg | [235] |
| 277. | Section of the geological structure of the Island of Eigg | [236] |
| 278. | View of the Scuir of Eigg from the east | [237] |
| 279. | Natural section at the cliff of Bideann Boidheach, north-west end of the Scuir of Eigg | [239] |
| 280. | View of the Scuir of Eigg from the south | [242] |
| 281. | View of the Scuir of Eigg from the south-west of the Loch a Bhealaich, showing the bedded character of the mass | [243] |
| 282. | Section at the base of the Scuir of Eigg (east end) | [244] |
| 283. | Terraced hills of basalt plateau (Macleod's Tables), Skye | [250] |
| 284. | "Macleod's Maidens" and part of basalt cliffs of Skye | [251] |
| 285. | Intercalated group of strata between Basalts, An Ceannaich, western side of Skye | [252] |
| 286. | Escarpment of Plateau-basalts, Cliffs of Talisker, Skye | [253] |
| 287. | Section of the largest of Macleod's Maidens | [254] |
| 288. | Dying out of lava-beds, east side of Sandö, Faroe Isles | [257] |
| 289. | Lenticular lavas, western front of Hestö, Faroe Isles | [257] |
| 290. | Lenticular lavas, east side of Svinö, Faroe Isles | [258] |
| 291. | Section at Frodbonyp, Suderö, Faroe | [258] |
| 292. | Fissure (gjá) in a lava-field, Iceland. (From a photograph by Dr. Tempest Anderson) | [262] |
| 293. | Cones on the great Laki fissure, Iceland. (From a photograph by Dr. Tempest Anderson) | [263] |
| 293a. | Plan of small craters along the line of great Laki fissure, Iceland. (After Mr. Helland, reduced) | [264] |
| 294. | Slemish, a volcanic neck or vent on the Antrim plateau, seen from the north | [272] |
| 295. | Section of volcanic vent at Carnmony Hill (E. Hull) | [272] |
| 296. | Section of the east side of Scawt Hill, near Glenarm | [273] |
| 297. | Section of Neck of basalt, Bendoo, Ballintoy | [273] |
| 298. | Volcanic Neck of dolerite near Cushendall | [274] |
| 299. | Section of Volcanic Neck at 'S Airde Beinne, near Tobermory, Mull | [274] |
| 300. | Interior of the Volcanic Neck of 'S Airde Beinne, near Tobermory, Mull | [275] |
| 301. | Diagram to show the probable relation of the Neck at Carrick-a-raide, Antrim, to an adjacent group of tuffs | [277] |
| 302. | Section of agglomerate Neck at Maclean's Nose, Ardnamurchan | [279] |
| 303. | Diagram to show the probable relations of the rocks on the southern flank of Beinn Dearg Bheag | [282] |
| 304. | Section of Volcanic Vent and connected lavas and tuffs, Scorr, Camas Garbh, Portree Bay, Skye
| [284] |
| 305. | Section of the Volcanic Series at Ach na Hannait, south of Portree, Skye | [288] |
| 306. | View of part of a Volcanic Neck at the eastern end of the island of Canna. (From a photograph by Miss Thom) | [289] |
| 307. | Columnar Basalt invading agglomerate of Volcanic Vent, Coroghon Mòr, Isle of Canna. (Height above 20 feet) | [291] |
| 308. | Columnar Basalt invading Volcanic conglomerate, north side of Alman Islet, Canna | [291] |
| 309. | View of neck-like mass of breccia, Brochel, Raasay | [292] |
| 310. | View of Volcanic Neck piercing and overlain by the Plateau-Basalts, Stromö, entrance of Vaagöfjord, Faroe Islands. (From a photograph by Colonel Evans) | [294] |
| 311. | Section of the same Neck as that shown in [Fig. 310] | [295] |
| 312. | Volcanic Neck close to that shown in Figs. [310] and [311] | [296] |
| 313. | Section of wall of another Neck of agglomerate in the same group with those represented in Figs. [310], [311], and [312] | [296] |
| 314. | View of "Segregation-Veins" in a dolerite sill, Portrush, Antrim | [300] |
| 315. | View of Fair Head, from the east, showing the main upper sill and a thinner sheet cropping out along the talus slope | [301] |
| 316. | View of Fair Head from the shore. (From a photograph by Mr. R. Welch) | [302] |
| 317. | Section at Farragandoo cliff, west end of Fair Head, showing the rapid splitting up and dying out of an Intrusive Sheet | [304] |
| 318. | View of the Trotternish Coast, showing the position of the band of Sills | [305] |
| 319. | Columnar Sill intrusive in Jurassic Strata east of Kilmartin, Trotternish, Skye | [306] |
| 320. | View of the northern precipice (500 feet high) of the largest of the Shiant Isles. (From a photograph by Colonel Evans) | [308] |
| 321. | Section of thin Intrusive Sheets and Veins in carbonaceous shales lying among the Plateau-basalts, cliffs north of Ach na Hannait, between Portree Bay and Loch Sligachan | [311] |
| 322. | Upper part of Sill, Moonen Bay, Waternish, Skye, showing the divergence of veins | [313] |
| 323. | Section of the base of the Basalt-plateau with sill and dykes, Sound of Soa, Skye | [314] |
| 324. | Section of Dolerite Sill cut by another sill, both being traversed by dykes, Rudh' an Iasgaich, western side of Sleat, Skye | [316] |
| 325. | Section to show Bedded and Intrusive Sheets, Eigg | [318] |
| 326. | Ground plan of Sills at Ben Hiant, Ardnamurchan | [321] |
| 327. | Section of two Sills in schistose grits, west end of Beinn na h-Urchrach, Ardnamurchan | [322] |
| 328. | Sill traversing bedded Basalts, cliffs of Stromö, at entrance of Vaagöfjord | [323] |
| 329. | View of the same Sill seen from the channel opposite the island of Kolter | [324] |
| 330. | Granulitic and coarsely foliated Gabbro traversed by later veins of felspathic Gabbro, Druim an Eidhne, Cuillin Hills, Skye | [331] |
| 331. | Scuir na Gillean, Cuillin Hills, showing the characteristic craggy forms of the Gabbro. (From a photograph by Mr. Abraham, Keswick) | [335] |
| 332. | Section across Glen Brittle, to show the general relations of the Bedded Basalts and the Gabbros | [336] |
| 333. | View of the crest of the Cuillin Hills, showing the weathering of the Gabbro along its joints and of a compound basic dyke which rises through it. (From a photograph by Mr. Abraham, Keswick) | [338] |
| 334. | Section across the Coire Uaigneich, Skye | [341] |
| 335. | Banded and puckered gabbro, Druim an Eidhne, Glen Sligachan, Skye | [342] |
| 336. | Banded structure in the Gabbro, from the ridge of Druim an Eidhne, between Loch Coruisk and Glen Sligachan
| [343] |
| 337. | Banded and doubly folded Gabbro, Druim an Eidhne, 10 feet broad | [345] |
| 338. | Sketch of banded structure in the Gabbros of the hills at the head of Loch Scavaig | [347] |
| 339. | Outline of the hills of the Island of Rum, sketched from near the Isle of Eigg | [350] |
| 340. | View of Allival, Rum, sketched from the base of the north-east side of the cone | [352] |
| 341. | Section of foliated Gabbros in the Tertiary volcanic series of Allival, Rum | [353] |
| 342. | Altered Plateau-Basalts invaded by Gabbro, and with a Dyke of prismatic Basalt cutting both rocks, north slope of Ben Buy, Mull | [357] |
| 343. | Theoretical representation of the structure of one of the Gabbro bosses of the Inner Hebrides | [362] |
| 344. | Section through the Puy de la Goutte and Puy de Chopine | [374] |
| 345. | View of the Huche Pointue and Huche Platte west of Le Pertuis | [376] |
| 346. | View of Glamich, 2537 feet, Glen Sligachan. (From a photograph by R. J. A. Berry, M.D., lent by the Scottish Mountaineering Club) | [380] |
| 347. | Section across the north slope of Beinn an Dubhaich, Skye | [383] |
| 348. | Section from Beinn Dearg to Beinn an Dubhaich, Skye | [385] |
| 349. | Section at north end of Beinn na Cro, Skye | [388] |
| 350. | Ground-plan of basic dyke in Cambrian limestones truncated by granophyre which encloses large blocks of the dyke, Torrin, Skye | [393] |
| 351. | Section on south side of Beinn an Dubhaich, Skye, showing the truncation of a basalt-dyke | [394] |
| 352. | View of the hills on the south side of the head of Loch na Keal, showing the junction of the Granophyre and the bedded basalts | [396] |
| 353. | Section on south side of Cruach Tòrr an Lochain, Mull | [398] |
| 354. | Section at head of Allt na Searmoin, Mull | [398] |
| 355. | Section on south side of Beinn Fhada, Mull | [399] |
| 356. | Section to south of Loch na Dàiridh, Mull | [400] |
| 357. | Section of junction of south side of Loch Ba' Granophyre boss, with the bedded basalts, Mull | [401] |
| 358. | Mass of dark gabbro about two feet in diameter traversed by pale veins of Granophyre, lying on north slope of Creag na h-Iolaire, Mull | [402] |
| 359. | Section at Creag na h-Iolaire, Glen More, Mull, showing basalts and gabbros resting on and pierced by Granophyre | [402] |
| 360. | Section on north side of Orval, Rum | [404] |
| 361. | Junction of Quartz-porphyry (Microgranite) and basic rocks, south-east side of Orval, Rum | [404] |
| 362. | Junction of Granophyre and gabbro, north side of St. Kilda | [410] |
| 363. | Veins of Granophyre traversing gabbro and splitting up into thin threads, north side of St. Kilda | [411] |
| 364. | Pale Granophyre injected into dark basalt, South Bay, St. Kilda | [412] |
| 365. | Veins of Granophyre traversing a fine-grained gabbro and scarcely entering a coarse-grained sheet, west side of Rueval, St. Kilda | [413] |
| 366. | View of sills and veins of pale Granophyre traversing sheets of gabbro, west side of St. Kilda. (From a photograph by Colonel Evans) | [414] |
| 367. | Section of the sea-cliff below Conacher, St. Kilda, showing basic dykes in Granophyre | [417] |
| 368. | Triple basic dyke, sea-cliff, east side of St. Kilda | [417] |
| 369. | Jointed structure of the Granite near the top of Goatfell, Arran. (From a photograph by Mr. W. Douglas, lent by the Scottish Mountaineering Club) | [419] |
| 370. | Intrusive Rhyolite in the lower basalt group of Antrim, Templepatrick | [427] |
| 371. | Section across the southern slope of Carnearny Hill, Antrim
| [427] |
| 372. | Section across the Granophyre Sills at Loch a' Mhullaich, above Skulamus, Skye | [433] |
| 373. | Section to show the connection of a sill of Granophyre with its probable funnel of supply, Raasay | [436] |
| 374. | Granophyre sill resting on Lower Lias shales with a dyke of basalt passing laterally into a sill, Suisnish Point, Isle of Raasay | [436] |
| 375. | Weathered surface of spherulitic Granophyre from dyke in banded gabbros, Druim an Eidhne, Meall Dearg, Glen Sligachan, Skye. Natural size | [438] |
| 376. | Plan of portion of the ridge north of Druim an Eidhne, Glen Sligachan, Skye, showing three dykes issuing from a mass of Granophyre | [439] |
| 377. | Weathered surface of spherulitic Granophyre, from dyke in banded gabbros, Druim an Eidhne, Meall Dearg, Glen Sligachan, Skye. Natural size | [440] |
| 378. | Plan of pale Granophyric dyke, with spherulitic and flow-structure, cutting and enclosing dark gabbro, Druim an Eidhne | [441] |
| 379. | Dyke (six to ten feet broad) proceeding from a large body of Granophyre and traversing gabbro, from the same locality as Figs. [375] and [377] | [442] |
| 380. | Section of intruded veins of various acid rocks above River Clachaig, Mull | [443] |
| 381. | Pitchstone vein traversing the bedded basalts, Rudh an Tangairt, Eigg | [445] |
| 382. | Reversed fault on the eastern side of Svinö, Faroe Isles | [454] |
| 383. | Reversed fault on the north-east headland of Sandö, Faroe Isle | [454] |