# Transactions of the Geological Society, 1st series, vol. 4/Index

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| Actinolite rock, mass of in gneiss, in the Island of Oransa | 186 |
| Adularia, found at Tintagel | 424 |
| Agate pebbles, found in Sky | 188 |
| —————— found at Kinnoul, described | 225 |
| ——————————————, difficulty of describing the manner of their formation | 226 |
| ———————— of the Giant's Causeway, the parallel plates lie in a horizontal position | 419 |
| ———————— decomposition of, in the gravel of Litchfield | 428 |
| Aikin, Arthur, Esq. Notice of some peculiarities observed in the gravel of Litchfield | 426 |
| ————————, Notice on Shropshire witherite | 488 |
| ————————, on a green waxy substance found near Stockport | 445 |
| Alcyonia, found in the sandstone at Whorlbury Camp | 218 |
| Allen, William, F.R.S. Barometrical Measurements, by | 434 |
| Alluvium, of Northumberland and Durham described | 95 |
| ————, account of a remarkable deposit of in Sky | 189 |
| Alumine, its use when combined with lime for mortar | 433 |
| Aluminous Strata, at Campsie, Mr. Mackintosh, on the | 445 |
| Analcime, of a brick red colour, found in Sky | 188 |
| Anatase, on the primitive crystal of | 250 |
| Asbestus, found in Melmerby scar | 88 |
| Avanturine, a variety of quartz rock | 272 |
| Augite, found in grains imbedded in the basalt of Teesdale | 74 |
| Augit rock, a rock of the trap family so called | 182 |
| Baculites, found by Mr. Hony, near Maestricht | 312 |
| Barometrical Measurements, by Mr. Allen and Mr. Woods | 434 |
| Barytes, Sulphate of, Mr. Phillips on the primitive crystal of | 233 |
| ————, on the cleavage of | 246 |
| Basalt occurs in the lead mine measures of Northumberland | 73 |
| ———— sometimes a regular bed in them | 73 ​ |
| Basalt in the lead mine measures of Northumberland agrees in situation with the toadstone of Derbyshire | 73 |
| ───── overlying masses of, occur in many parts of the lead mine measures | 74─78 |
| Basaltic dykes. See Dykes |
| Basaltic veins in the granite and schist of Cruachan | 123 |
| Beadnel Bay, dyke at, described | 102 |
| Belfast Lough, nuts filled with calcareous spar found in | 443 |
| Bennet, The Hon. Henry Grey, on a whin dyke traversing limestone in the county of Northumberland | 102 |
| Bitumen, found in some varieties of the magnesian limestone near Sunderland | 6 |
| Bituminous Limestone, analysis of one, by Dr. Clarke | 430 |
| Blakheath, account of plastic clay beds near | 288 |
| Blende, note on the cleavage of | 257 |
| Bog iron ore, found in the Cheviot hills | 95 |
| Boring, estimate of the expence attending at Roxburg or Berwick | 101 |
| Breccia, occurrence of one of a modern date at Loch Ericht, having a siliceous cement | 266 |
| Brendon Hills, height of the | 437 |
| Bright, Richard M.D. on the strata in the neighbourhood of Bristol | 193 |
| Bristol, Dr. Bright and Mr. Cumberland, on the strata in the neighbourhood of | 193 |
| ─────, sections of the strata near, given by Dr. Bright and Mr. Cumberland | 197 |
| ─────, horizontal beds lying on the edges of the inclined strata in the neighbourhood of | 202 |
| Buckland, The Rev. W. Description of an insulated group of rocks of slate and greenstone, in Cumberland and Westmoreland, on the east side of Appleby, between Melmerby and Murton | 105 |
| ──────────, Description of a series of specimens from the plastic clay near Reading, Berks: with observations on the formation to which those beds belong | 277 |
| ──────────, Description of the paramoudra, a singular fossil body found in the chalk of the north of Ireland, with some general observations upon flints in chalk, tending to illustrate the history of their formation | 413 ​ |
| Cader Idris, height of | 435 |
| Calamine, found frequently in the limestone near Bristol | 200 |
| Campsie, Mr. Mackintosh on the albuminous strata, at | 445 |
| Carlisle, plain of, consists principally of red sandstone | 105 |
| Carnerlians, account of the manner in which they are procured in Cambay | 447 |
| Chalcedony, vegetables in | 398 |
| Chalk Flints. See Flints. |
| Chert, lias changed into, in Sky | 176 |
| Cheviot Hills, composed of porphyry | 93 |
| ─────────, its junction with the lead mine measures not visible | 93 |
| ─────────, bog iron ore and hematite found in | 95 |
| Chlorite, frequent in the trap of Kinnoul | 223 |
| ──────, crystals of, in quartz | 398 |
| Chlorite Schist, with felspar and quartz, rock composed of these substances interlaminated together, passing out of gneiss, at Sleat, in Sky | 159 |
| Clarke, Edward Daniel, LL.D. Analysis of one hundred parts of a dark bituminous limestone, from the parish of Whiteford, in Flintshire, North Wales | 430 |
| Clay ironstone, formerly collected by the Carron Company on Holy Island 67 |
| ─────────── found in the shale of the lead mine measures | 67 |
| ─────────── sometimes forming septaria ib. |
| Coak, Mr. Taylor on some appearances in | 448 |
| Coal, estimate of the quantity annually raised in the Northumberland coal-field | 50 |
| ─── found in most parts of the lead mine districts | 67 |
| ─── quantity of, shipped at Newcastle and Sunderland | 99 |
| ─── quantity shipped from Hartley and Blyth collieries | 100 |
| ─── quantity imported into London | 100 |
| ─── dug near Melmerby and Ousby | 118 |
| ─── in Sky, appearances of | 178 |
| ─── altered by contact with basaltic dykes. See Dykes. |
| Coal measures of Northumberland and Durham described | 10 |
| ──────────── some of the lower beds of resemble the lead mine measures | 11 ​ |
| Coal Measures, variable thickness of the beds of the | 12 |
| ───────── consequent difficulty of giving a general section | 13 |
| ───────── various beds composing the, particularly detailed | 15 |
| ───────── dykes in the | 21 |
| ───────── other irregularities in the | 29 |
| ───────── sections of the | 31 |
| ───────── mineral springs occurring in | 51 |
| ─────── shattered strata of, accompanying the slate and greenstone rocks near Appleby | 106─112 |
| Coal works section ol, in the lead mine measures | 69 |
| Conglomerate, lying on the trap at Kinnoul | 227 |
| Conybeare, Rev. J. J. Memoranda relative to the porphyritic veins, &c. of St. Agnes in Cornwall | 401 |
| ──────── Notice of fossil shells in the slate of Tintagel | 424 |
| Copper, ores of, found in Northumberland and Durham | 84 |
| Coruisk, in Sky, rocks of, described | 183 |
| Corundum, on the primitive crystal and cleavage of | 254 |
| Cotham stone, one of the beds of the lyas | 196 |
| Cross courses, in the mine of Huel Peever, their extent | 142 |
| ────────── of later formation than the metallic veins | 148 |
| ────────── effect of one on the killas through which it passes | 154 |
| Cross Fell, one of the highest mountains in England | 58 |
| Cruachan, Dr. Mac Culloch's remarks on the mountain so called, in Argyleshire | 117 |
| ──────, difference in the porphyry rocks of, from those of Arran | 134 |
| Cumberland, George, Esq. Notes extracted from his communications on the strata in the neighbourhood of Bristol | 193 |
| ─────────── On the strata at Whorlbury Camp in Somersetshire | 216 |
| ─────────── Account of a trap rock at Micklewood | 444 |
| Cyanite, on the primitive crystal and cleavage of | 253 |
| Dinsdale sections at | 97 |
| Diopside, on the primitive crystal and cleavage of | 252 ​ |
| Dorking, height of hills near | 437 |
| Dover, height of cliffs near | 437 |
| Dunkerry Beacon, height of | 437 |
| Durham and Northumberland. N. J. Winch, Esq. on the Geology of | 1 |
| Dyke of basalt in the coal-field of Northumberland and Durham, described | 21 |
| ─── effect of on the coal where in contact with it 21, 24, 25, 26, 27 |
| ─── mineral resembling adularia found in that at Coley Hill | 21 |
| ─── horizontal section of that at Walker colliery | 22 |
| ─── at Coley hill described | 21 |
| ─── at Walker colliery | 22 |
| ─── at Walbottle Dean | 23 |
| ─── at Tynemouth castle | 24 |
| ─── at Butterby | 24 |
| ─── Ninety fathom | 25 |
| ─── Birtley | 27 |
| ─── Thistle pit | 28 |
| ─── Heworth | 28 |
| ─── of basalt in the lead mine measures | 76 |
| ─── at Tynemouth Priory | 96 |
| ─── traversing limestone in Northumberland. Mr. Balmur's account of one | 102 |
| ─── the whin composing it different from that of other deposits | 104 |
| ─── through slate at Caterpallet composed of felspar mixed with talc | 109 |
| Elvan, the name given to porphyritic veins in Cornwall | 401 |
| ────, a Cornish term applied to chlorite and quartz | 152 |
| Encrini, found abundantly in the black rock of Bristol | 198 |
| Epidote, forms a constituent part of the trap of Garsven in Sky | 188 |
| Exmoor, height of | 437 |
| Extracts, from the Minute book of the Geological Society | 443 |
| Fetid limestone, found in botryoidal masses in the magnesian limestone of Hartlepool | 9 ​ |
| Fire-damp, account of | 54 |
| Flints in Chalk, Mr. Buckland's Observations on the history of | 413 |
| ───────────, Theory of their formation on organic remains | 420 |
| ───────────, formed in a different manner from the geodes in trap rocks | 422 |
| Flints, plated, veins of, in chalk | 417 |
| Flinty slate, appearance of in the clay slates of Cruachan when in contact with veins | 118 |
| ───────── occurs on the Western shore of Sky | 176 |
| Fossil, remarkable one found at Whorlbury camp | 217 |
| Fossils, of the plastic clay formation 279, 285, 286, 292, 296-300 |
| ──────, of the Plymouth limestone, observed by Mr. Hennah | 410 |
| Fossil Fish, found in the magnesian limestone near Sunderland | 9 |
| Fossil Shells, found in the slate of Tintagel | 424 |
| ───────── of Snowdon | 425 |
| Galena, found in strings in Whitley quarry near Cullercoats | 5 |
| ──────, the only metallic ore found in the magnesian limestone of Northumberland and Durham | 9 |
| ──────, found in nodules of clay ironstone in the shale of the coal measures | 19 |
| ──────, filling a crevice by the side of a basaltic vein | 24 |
| ──────, found near Bristol | 200─203 |
| Gilby, W.H. M.D. On the magnesian limestone and red marl or Sandstone of the neighbourhood of Bristol | 210 |
| Glen Gloy, traces of parallel roads in | 334 |
| Glen Roy, Dr. Mac Cmmocn on the parallel roads of | 314 |
| ──────, detailed description of the parallel roads of | 317 |
| ──────, their breadth | 322 |
| ──────, their elevation above the sea and neighbouring lochs | 327 |
| ──────, causes which produced them, were equal and similar | 328 |
| ──────, connexions of with the adjoining glens | 332 |
| ──────, form and structure of the parallel roads of | 337 |
| ──────, its connexions with the sea | 338 |
| ──────, statement and examination of the hypothesis that the parallel roads of, are works of art, as roads for hunting | 343 |
| ──────, statement of the three hypotheses which attribute the formation of the parallel roads to the action of water | 349 ​ |
| Glen Roy, examination of the first hypothesis─a deluge or large torrent | 352 |
| ──────────────── second hypothesis; remains of water terraces | 362 |
| ──────────────── third hypothesis—a lake occupying the valley | 367 |
| ────────, difficulties attending the third hypothesis | 374 |
| ────────, position of the boundaries of the supposed lake | 375-384 |
| ────────, the third hypothesis the most probable | 374-380 |
| ────────, the level of the sea supposed to be marked by these lines | 390 |
| Glen Turit, traces of parallel roads in, described | 332 |
| Glenwhelt, the highest land in England in the parallel from Newcastle to Carlisle | 57 |
| Gneiss, of peculiar character, occurs in the promontory of Sleat in Sky | 159 |
| ──────, transition between it and graywacke and sandstone | 161-165 |
| Goniometer, common, not calculated to measure crystals with perfect accuracy | 237 |
| ─────────, reflecting, measurement of crystals by the | 233-241 |
| Granitic rocks, detached masses of, compose the hill of West Down in Devonshire | 147 |
| Granite, found at Dufton Pike in Westmoreland | 109 |
| ───────, junction of, with the schist at Cruachan | 120 |
| ───────, the country near Cruachan appears to consist chiefly of | 125 |
| ───────, its extent there | 128 |
| ───────, crowns the summit of Kithill in Devonshire | 147 |
| ───────, deposit of upon the schist at Cligga point | 402 |
| Granite veins, penetrate the schist of Cruachan at its junction | 120 |
| ───────────, in slate in the Mourne Mountains | 443 |
| Gravel, of Litchfield, Mr. Aikin's observations on | 426 |
| Greenstone and Slate, group of rocks of, described | 105 |
| Graywacké slate, found in the Cheviot hills | 94 |
| ──────── series, transition between it and gneiss in Sky | 161 |
| Grouan, a Cornish term applied to clay porphyry | 152 |
| Hangman Hill, height of | 437 ​ |
| Heliotrope, occurs in the trap of Kinnoul | 227 |
| Helvellyn, height of | 436 |
| Hœmatite found in the Cheviot hills | 95 |
| Hennah, Rev. Richard, Observations on the limestone of Plymouth | 410 |
| Holy Island, clay ironstone formerly collected on, by the Carron Company | 67 |
| Hony, the Rev. W.E. Geological Remarks on the Vicinity of Maestricht | 310 |
| Hornblende rock, found in the Cheviot hills | 95 |
| ───────── schist, alternates with gneiss at Sleat in Sky | 160 |
| Huel Peever, Mr. William's account of the veins of | 139 |
| Hastings, height of hills near | 437 |
| Hypersthene rock, rock of the trap family so called | 184 |
| Infiltration, process of, by which veins are formed | 395 |
| Ingleborough, height of | 435 |
| Iron, ores of; found in Northumberland and Durham | 85 |
| Iron pyrites, found abundantly in coal and shale; sold to the manufacturers of green vitriol | 19 |
| Iron sand, magnetic, found by Dr. Traill in Cheshire | 447 |
| Iron, specular, on the primitive crystal and cleavage of | 251 |
| Iron work, one only now remaining in Northumberland | 67 |
| Iserine, found by Dr. Traill in Cheshire | 447 |
| Jasper, its resemblance in character to porphyry | 134 |
| Junction of granite and schist at Cruachan | 120 |
| ────── of trap and schist at Kinnoul | 228 |
| Killas, traversed by beds of other rocks in Devonshire | 151 |
| ────, Dr. Mac Culloch on certain colours in | 398 |
| ────, the principal rock from the borders of Dartmoor along the Tavy | 146 |
| ────, extends to the coast, and joins the Plymouth limestone | 148 |
| ────, of Devonshire intersected by metallic veins | 148 |
| ────, altered in its texture by a cross course | 154 ​ |
| Kinnoul, Dr. Mac Cullochs's Observations on the Hill of | 220 |
| ──────, composed chiefly of trap | 221 |
| ──────, trap conglomerate at | 227 |
| ──────, junction of trap and schist at | 228 |
| ────── agates, difficulty of explaining their formation | 226 |
| Lakes of Scotland, accumulations of alluvium are gradually filling them | 381 |
| Laumonite, found near Loch Eynort in Sky | 187 |
| ────────, alteration in its degree of hardness | 188 |
| Lead, quantity of, annually shipped at Newcastle and Stockton | 82 |
| ────, carbonate of, on the primitive crystal and cleavage of | 257 |
| ────, sulphate of, on the primitive crystal and cleavage of | 259 |
| ──── mine measures, of Northumberland and Durham described | 57 |
| ────────────────, uniformity of in the southern part of Northumberland | 58 |
| ────────────────, total thickness of estimated | 58 |
| ────────────────, sections of the | 59 |
| ────────────────, coal found in most parts of | 67 |
| ────────────────, sections of the collieries in | 69 |
| ────────────────, organic remains in the | 71 |
| ────────────────, metallic veins in | 77 |
| ────────────────, minerals of described | 83 |
| Lemmington, iron work at, the only one now in Northumberland | 67 |
| Lewisham, account of the plastic clay beds near | 285 |
| Lias, of Sky converted into chert | 176 |
| ─── occurs at Redland near Bristol | 196 |
| Limestone near Ord in Sky, contains flint or chert in nodules | 171 |
| ──────── and Coal measures, shattered beds of accompanying the slate and greenstone rocks near Appleby | 106-112 |
| ───────── beds of the lead mine measures described | 65 |
| ─────────── more regular thickness in than the shale or sandstone | 66 |
| ────────, bituminous. See Bituminous Limestone |
| ────────, entrochal, insulated mass of at Keisley | 114 |
| ────────, in balls, singular stratum of, near Bristol | 201 |
| ──────── series of Sky described | 166 ​ |
| Linton, height of | 437 |
| Litchfield, Mr. Aikin's observations on the gravel of | 426 |
| Lodes. See Veins. |
| London, account of the plastic clay beds near | 283 |
| ─────, on the formation of the marsh lands near | 302 |
| ───── clay, occurring at Shooter's Hill | 290 |
| Lyas. Sec Lias. |
| Lydian stone, appearance of in the clay slate of Cruachan when in contact with veins | 118 |
| Mac Culloch, M.D. F.L.S. President of the Geological Society, Observations on the Mountain Cruachan in Argyleshire, with some remarks on the surrounding country | 117 |
| ──────────── Corrections and additions to the Sketch of the Mineralogy of Sky, published in the Third Volume of the Transactions of the Geological Society | 156 |
| ─────────── Observations on the Hill of Kinnoul in Perthshire | 220 |
| ──────────── Supplementary observations on quartz rock, made in 1814 | 264 |
| ──────────── Further observations, 1816. | 273 |
| ──────────── On the parallel roads of Glen Roy | 314 |
| ──────────── On a shifted vein occurring in limestone | 392 |
| ──────────── Explanation of a Supplementary plate to the paper on vegetable remains preserved in chalcedony, printed in the Second Volume of the Transactions of the Geological Society | 398 |
| ──────────── On a peculiar disposition of the colouring matters in a schistose rock | 399 |
| Mac Donnel, Dr. notice of nuts filled with calcareous spar in Belfast Lough | 443 |
| ────────── on veins of granite in slate in the Mourne Mountains | 443|} ​ |
| Mackintosh, C. Esq. on the albuminous strata at Campsie | 445 |
| Maestricht, Mr. Hony's remarks on the Geology of the vicinity of | 310 |
| Magnesian Breccia, note on, by Hsmw Wnnvnrou, Esq. | 205 |
| ─────────────, its connection with the red marl, and occurrence near Bristol, and on the Mendip hills | 207 |
| ─────────────, conjecture as to the former extent of the bed of, near Bristol | 207 |
| ─────── limestone, of Northumberland and Durham described | 3 |
| ─────────────, remarkable deposit ol, on the coal measures at Cullercoats in Northumberland | 4 |
| ─────────────, flexible variety found near Sunderland | 6 |
| ─────────────, near Sunderland sometimes contains bitumen | 6 |
| ─────────────, of Northumberland and Durham rests on the coal measures | 8 |
| ─────────────, no coal mine yet won by sinking through it | ibid. |
| ─────────────, and red marl or sandstone of the neighbourhood of Bristol, Dr. Gilby on | 210 |
| ─────────────, near Bristol, analysis of | 212-215 |
| ─────────────, bed of, conformable to the mountain limestone, near Ross and near Bristol | 215 |
| Magnet affected by the summit of Cruachan | 124 |
| Manganese, found in small quantities in Sky | 189 |
| ─────────, found near Bristol | 201 |
| Marble, of good quality found in the Isle of Tino | 446 |
| Marle-shell. See Shell-marle. |
| Marsh Lands, near London, notices on the formation of | 302 |
| Melmerhy, description of a group of rocks of slate and greenstone near to | 105 |
| Mendip hills, height of the | 436 |
| Micaceous schist of Sleat in Sky, does not compose the whole promontory, as stated in the preceding volume | 159 |
| Micklewood, Mr. Cumberland's account of a trap rock at | 444 |
| Minehead, height of North hill near | 437 |
| Mines of Devonshire, near Morwel Down, enumerated | 149 |
| Mineral Springs occurring in the coal field described | 51 |
| ───────────── in the lead mine measures | 88 ​ |
| Morwel Down, in Devonshire, description of the tunnel through | 146 |
| Mountain limestone, forms an elliptical basin in the neighbourhood of Bristol | 210 |
| ────────────, coal measures resting on it | 211 |
| Needlestone, found in Sky | 189 |
| Northumberland, Mr. Bennet's account of a whin dyke in | 102 |
| Northumberland and Durham, N. J. Winch, Esq, on the Geology of | 1 |
| Nuts, filled with calcareous spar, found in Belfast Lough | 443 |
| Okehampton, height of | 437 |
| Old red sandstone. See Red Sandstone, Old. |
| Olivine, found in grains imbedded in the basalt of Teesdale | 74 |
| ─────── found in Sky | 189 |
| Oolite, stratum of found in the magnesian limestone beds at Hartlepool | 7 |
| Organic remains found in the magnesian limestone | 10 |
| ───────────── found in the coal measures | 19 |
| ───────────── none marine, among those of the coal measures | 20 |
| ───────────── in the lead mine measures | 71 |
| ───────────── in the limestone of Sky 169, 175, | 176 |
| Paralel Roads of Glen Roy, Dr. Mac Culloch on the 314 |
| Paramoudra, description by Mr. Buckland of the fossil so called | 413 |
| ────────── its mineral History connected with that of many spungiform bodies found in chalk | 416 |
| Pentowan. Mr. Smith on the stream works of | 404 |
| Pen-y gant, height of | 435 |
| Petroleum, found in the black rock of Bristol | 199 |
| Phillips, William, Esq. Account of some attempts to ascertain the angles of the Primitive Crystals of Quartz and the Sulphate of Barytes | 233 |
| ───────────── On the measurements, by the reflecting Goniometer of certain primitive crystals; with observations on the methods of obtaining them by mechanical division along the natural joints of crystals | 241 ​ |
| Plastic clay, Mr. Buckland on the beds of | 277 |
| ────────, account of the beds of near Reading | 282 |
| ────────, ────────────── near London | 284 |
| ────────, ────────────── on the coast of Sussex | 294 |
| ──────────────── their connexion with those of France | 298 |
| Plumsted, account of the Plastic Clay beds near | 290 |
| Plymouth, Mr. Hannah's observations on the limestone of | 410 |
| Porphyritic veins, of St. Agnes. Rev. J. J. Conybeare on | 401 |
| ─────────────── probably contemporaneous with the schistose rocks which they traverse | 402 |
| ─────────────── appearance of the schist in contact with them | 403 |
| Porphyry of the Cheviot hills described | 93 |
| ─────── veins of, traversing the schist and granite of Cruachan | 121 |
| ──────────────── generally appear perpendicular | 121 |
| ──────── of Cruachan, its varieties described | 122 |
| ─────────────── shews a regular series of transition from porphyry to trap | 123 |
| Potter's clay, found immediately below the soil over the coal measures | 16 |
| Quartz, beds of, interstratified with the marble limestone of Sky | 167 |
| ────── Mr Phillips on the primitive crystal of | 233 |
| ────────────── on the cleavage of | 247 |
| Quartz rock and schist series of Sky, described | 161 |
| ──────────────── alternates repeatedly with red sandstone | 162 |
| ────────, Dr. Mac Culloch's supplementary observations on | 264 |
| ────────, circumstances to prove that its origin is partly mechanical | 268 |
| ────────, avanturine a variety of | 272 |
| ────────, particulars of its occurrence in Sky | 273 |
| ────────, alternations of, with red sandstone and greywacke schist | 274 |
| Quicksands, covering the coal measures | 30 ​ |
| Reading, account of the plastic clay beds, near | 278 |
| Red marl or sandstone of the south-eastern part of Durham described | 2 |
| ──────────────── analogous to the red sandstone of Nottinghamshire | 3 |
| Red marl, probable identity of the deposites of, that cover the coal measures and abut against the inclined edges of mountain limestone | 208 |
| Red sandstone with gypsum composes the greater part of the plain of Carlisle | 105 |
| ────────── more recent than the old red sandstone | 106-115 |
| ──────────────────, its contact with the other rocks near Melmerby, described | 112 |
| ────────── near Melmerby the same as that of Cheshire and Salop | 116 |
| Red sandstone, Old, found in the Cheviot hills | 94 |
| ─────────────── interposed between the limestone series of Cross Fell, and the slate | 111 |
| ─────────────── the lowest rock of the neighbourhood of Bristol | 210 |
| ─────────────── bed of, in the slate near Cruachan | 119-135 |
| ─────────────── transition between it and gneiss in Sky | 161-165 |
| Resin and oil, substance composed of, found near Stockport | 445 |
| Roads, Parallel. See Parallel Roads. |
| Saddleback height of | 436 |
| Salt spring, issuing from the interstices of a basaltic vein at Butterby | 24 |
| Sandstone, varieties of in the coal measures, described | 17 |
| ────────, beds of in the lead mine measures described | 63 |
| ────────, of Strathaird in Sky, observations on | 171 |
| Satin spar, found in a black slate clay at Aldstone | 67 |
| Schist of Cruachan, its junction with the granite | 120 |
| ──────────── much indurated where in contact with the granite | 121 |
| Secondary strata, of Scotland, their line of separation from the primary generally noticed | 221 ​ |
| Section of the coal measures | 31 |
| ────── of the lead mine measures | 59 |
| ────── of collieries in the lead mine measures | 69 |
| ────── at Dinsdale | 97 |
| ────── of Catsgrove Hill, near Reading | 278, 281 |
| ────── of the Woolwich sand pits | 284 |
| ────── of Loam Pit Hill, near Lewisham | 285 |
| ────── at the canal at New Cross | 292 |
| ────── of the Castle Hill at Newhaven | 296 |
| ────── of the cliff near Dieppe | 298 |
| ────── of the Pentowan Stream works | 405, 406 |
| Shakespeare's Cliffs height of | 437 |
| Shale, numerous beds of, among the lead mine measures 66 |
| Shap Fells, height of | 432 |
| Shell Marle, Mr. Warburton, on some beds of, in Scotland | 305 |
| Shifted Vein, Dr. Mac Culloch on a | 392 |
| Silica, infiltration of | 266, 269 |
| Siliceous schist, on the western shore of Sky derived from shale | 176 |
| Skiddaw, height of | 436 |
| Sky, Dr. Mac Culloch's additions to the Sketch of the Mineralogy of, published in the Third Volume of the Transactions of the Geological Society | 156 |
| ─── alternations of gneiss and mica slate in, 159—with chlorite, schist, ib.—and hornblende schist, 160—transition of the gneiss series into graywacke, 161—165—Quartz rock series in, 161—Limestone series, 167—Trap, 173—Siliceous schist and chert, 17 6—Augit rock, 182—Hypersthene rock, 184—Minerals of, 186, seq. |
| ─── remarkable alluvial deposit in | 189 |
| Slate, converted into siliceous schist in Sky | 176 |
| ─── shells found in, at Tintagel | 424 |
| ────────────── on Snowdon | 425 |
| ─── granite veins tin, in he Mourne mountains | 443 |
| Slate and Greenstone, group of rocks of, described | 105 |
| Slate Clay, found throughout the Coal field | 17 |
| Sleat, Promontory of, in Sky, described | 159 |
| Sleat, in Sky, mass of trap at | 182 ​ |
| Smith, Edward, Esq, on the Stream works of Pentowan | 404 |
| Snowdon, shells found in the slate of, | 425 |
| ─────── height of | 434 |
| Springs, in the neighbourhood of Bristol, their situation 204 |
| St. Agnes, Rev J. J. Conybeare, on the porphyritic veins of | 401 |
| Strath, in Sky, remarkable trap veins at | 185 |
| Strontian, found near Knaresborough | 445 |
| ────── Sulphate of, found in balls in the sandstone near Bristol 196, 202, 214 |
| ────────────── on the primitive crystal and cleavage of, | 255 |
| Staurotide, on the primitive crystal of | 250 |
| Syenite, of Sky, described | 169 |
| Taylor, John, Esq. Description of the Tunnel of the Tavistock Canal, through Morwel Down in the county of Devon | 146 |
| ──────────── notice on some appearances in coak | 448 |
| Tin, Oxide of, Mr. Phillips on the cleavage of | 245 |
| Tino, Isle of, notice on the rocks of the | 446 |
| Tintagel, shells found in the slate of | 424 |
| Traill, T. S. M.D. notice of iserine and magnetic iron-sand in Cheshire | 447 |
| Trap, in the vicinity of Cruachan | 137 |
| ────, of Sky described | 178 |
| ────, variety of, called augit rock by Dr. Mac Culloch described | 182 |
| ────, variety of, called hypersthene rock by Dr. Mac Culloch described | 184 |
| ────, account of remarkable veins ol§ at Strath in Sky | 185 |
| ────, Kinnoul Hill composed chiefly of | 221 |
| ─────────────, its varieties there, described | 222 |
| ────, occurs at Micklewood in Gloucestershire | 444 |
| ──── of Kinnoul, both porphyritic and amygdaloidal | 223 |
| ─────────────, its junction with schist | 228 |
| ──── of Sky, additions to the account of | 180 |
| ──── of Irottemish, has the appearance of inter stratification and alternation with the strata it covers | 180 ​ |
| Trap, of Trotternish, the alternation only apparent, and this is probably the case in all other instances of such supposed alternation | 181 |
| ──────────────, columnar on a large scale | 181 |
| ──────────────, generally composed of augit and felspar | 182 |
| Trees, found in the marsh lands near London | 302 |
| Tunnel of the Tavistock canal, description of the | 146 |
| ─────────────────────, accuracy in the direction of the drift, its length and ventilation while making | 155 |
| Tweed, account of the beds on the banks of the | 90 |
| Trotternish in Sky, its rocks described | 178 |
| Veins, numerous and chiefly of porphyry traverse the slate of Cruachan | 118-121 |
| ──── of trap sometimes occur in the slatc of Cruachan | 118-123 |
| ──── of Huel Peever described by Mr. Williams | 139 |
| ──── of copper and tin run from north-east to south-west | 148 |
| ──── that do not run north-east and south-west, generally unproductive of metal and seem of newer formation | 148 |
| ──── occur but in few sorts of rocks | 151 |
| ──── run through all the strata | 151 |
| ──── at Morwel Down, their dip | 151 |
| ────, general notice of such as are productive near Morwel Down | 152 |
| ────, filled by infiltration | 395 |
| ────, porphyritic. See Porphyritic veins |
| Vegetable remains in chalcedony, Dr. Mac Culloch on | 398 |
| Ventilation of the drift for the Tunnel of the Tavistock canal, reference to account of | 155 |
| Warburton, Henry, Esq. Note on Magnesian breccia | 205 |
| ──────────── On some beds of Shell-marle in Scotland | 305 |
| Whernside, height of | 435 |
| William, John, Junr. Esq. Account of some remarkable disturbances in the veins of Huel Peever in Cornwall | 139 ​ |
| Winch, N.J. Esq. Observations on the Geology of Northumberland and Durham | 1 |
| Witherite, Mr. Aikin on, found in Shropshire | 438 |
| ————, analysis of | 442 |
| Whorlbury Camp in Somersetshire, George Cumberland, Esq. on the strata at | 216 |
| Woods, Samuel, Esq. Barometrical measurements by | 436 |
| Woolwich, account of the plastic clay beds near | 284 |
| Yester, height of | 437 |
| Zinc, ores of, found in Northumberland and Durham | 85 |
| Zircone, on the primitive crystal and cleavage of | 248 |
THE END
London Printed by William Phillips, George Yard, Lombard Street.