488 
THE ANCIENT VOLCANOES OF GREAT BRITAIN 
divisions of, 297 ; thickest conglomerates of, 
301 ; composition of conglomerates of, 302, 
315, 341 ; uneonformabilities in, 267, 328, 
333 ; Upper division of, 34S, 375, 3S3 : ii. 
42 
Olenellus-zone, i. 112, 130, 132, 140, 144 
Olenus-zone, i. 144 
Olivine, i. 154, 118, 420 ; ii. 58, 135 
Omagh, i. 315 
Ophitic structure, i. 21, 417 ; ii. 136, 184, 274 
type of dole rite, i. 418, 421 
Oregon, crater lake in, i. 58 
Orkney Isles, i. 271, 344, 350; ii. 121 
Orthoclase, ejected crystals of, ii. 79 
Orthophyre, i. 273, 276, 277, 308 
Osaun, A., ii. 191 
Oyonhausen, C. von, ii. 112, 280, 333, 340, 
367, 372, 381 
PAL/EcmcmrrE, i. 261 
Palaeozoic systems, i. 139 ; volcanic rocks 
resemble modern, i. 30 
Palagouite, i. 33, 61, 151, 180, 246, 422, 423 • ii 
44, 46, 57, 223 
Paradoxides-zone, i. 144 
Paramorphism, i. 249 
Peach, Mr. 11. N., i. 114, 128, 147, 168, 191, 
192, 195, 196, 197, 198, 199, 200, 216, 240 
277-294, 307, 308, 329, 331, 344, 345, 369, 
37o, 425, 426, 476 ; ii. 133, 145 
Pebidian, i. 145 
Pegmatite, i. 20, 119, 127, 418, 449 ; ii. 5, 368, 
43/ 
Pembrokeshire, volcanic rocks of, i. 145, 159 
205 
Penmaen-mawr, i. 209, 215 
Pennant, T., ii. 109 
Pennine chain, ii. 8 
Pentland Hills, volcanic series of the, i. 102, 
269, 273, 276, 279, 281, 285, 287, 289, 291 
311, 317 ’ 
Perlite, i. 130 
Perlitic structure, i. 19, 196, 199. 206, 211 216 
232, 274 
1 ei mian system, geographical conditions accom- 
panying the deposition of, ii. 53, 97 ; sub- 
divisions of, in S. W, England, 94; volcanic 
phenomena of, i. 46 ; ii. 55 ; lavas and tuffs 
of, 5i, 58 ; vents of, 62, 67, 70, 96: sills of 
91, 100 
Pernio-carboniferous strata, ii. 54 
Petersen, Dr., i. 275, 336 
Phillips, J., i. 133, 170, 205, 238 ; ii. 3 
J. A., i. 260, 261 
W., i. m ; ii. 95 
Phonolite, i. 880 (analysis) ; ii. 375 
Phyllite, i. 162, 222 
Picrite, i. 377, 417, 420, 448, 450 ; ii. 57 
— — type, i. 418 
Pillow-structure in lavas, i. 26, 184, 193, 201 
210, 244, 252 ; ii. 189, 259 
Pitchstone, i. 18, 19, 130; ii. 134, 174, 204, 
238, 242, 246, 370, 437, 444 
Plagioclase, ejected crystals of, ii. 79 
Plants fossil, in tuffs, i. 392 ; ii.,113, 198, 212, 
222 ’ 
Platania, G., i. 26 
Plateau-type of volcanoes, i. 42, 100, 308, 341 
364 ’ 
Plateaux, Carboniferous, of Scotland, i. 364 ; 
distribution of, 367 ; composition of, 377 ; 
structure of, 383 ; lavas and tuffs of, 383 ; 
vents of, 394 ; dykes and sills of, 406 ; close 
oj eruption of, 410 ; Tertiary, ii. 181 ; forma- 
tion of modern Icelandic, 265 
Player, Mr. J. H., analyses bv, i. 377, 381 ; 
ii. 138, 830 
Playfair, John, i. 363 ; ii. 110 
Plinthite, ii. 197 
Pliocene (supposed) of Lough Neagh, ii. 449 
Plutonic operations of volcanoes, i. 77 ; granite, 
88 B 
lTutonists and Naptunists, i. 363 : ii. 67, 95, 
110 , 112 
Pomeroy, voleanie series near, i. 315 
Porphyrite, i. 190, 193, 207, 229, 240, 252, 273, 
274, 377, 379 
Porphyritia structure, i. 19, 274 ; ii. 128 
Portlock, J. E., ii. 110, 111, 113, 199, 201, 
299, 864 
Portraine, conglomerates at, i. 244 
Portrush, shells in supposed basalt at, ii. 110, 
299 
Potstone, i. 125 
Pre-Cambrian rocks, i. Ill, 121, 126 
Pressure, experimental proof of effects of, i. 24 
Prestwick, Sir J., ii. 103 
Propylites, ii. 185, 388 
Proterobase, i. 247 
Pterygotug, i. 265 
Pumice in tuffs, i. 244, 422 ; ii. 17, 27, 28, 32, 
44, 46, 286, 288 ; in volcanic necks, i. 60, 
180 ; ii. 17, 39, 195 
Pumiceons structure, i. 15, 33, 34, 60 
Pays, as a type of volcano, i. 10, 44, 100, 414 ; 
probable subrerial nature of some, 432 ; Car- 
boniferous, 308, 364, 414, 424, 463 ; ii. 13, 
28, , 34, 47 ; Permian, ii. 62 ; Tertiary, 271, 
27 b 
Puy de Chopine, i. 32 ; ii. 374 
Dome, ii. 373 
Montehar, i. 32 
Pariou, i. 66, 70 ; ii. 31, 281 
Pyroclastic detritus, i. 31, 58, 61 
Pyromeride, i. 211 
Pyrope, ii. 58, 79 
Pyroxene, ii. 135 
Quartz-porphyry, i. 19, 156, 159, 160, 161, 
165, 277, 291, 314; ii. 96. 369, 420, 423, 
430, 431 
Quartz-trachyte, ii. 371 
Quartzite, i. 112, 170 
Raasay, basalt of, ii. 192 ; neck-like breccias 
in, 293 ; acid sill of, 430 
Raddling or red-staining of rocks, i. 250, 261 
Radiolariau cherts, i. 123, 167, 169, 173, 174, 
184, 106, 201, 244 
Rain-pittings in strata, i. 342 
Raisin, Miss, i. 161, 163, 164, 165, 210 
Ramsay, A. C., i. 126, 142, 143, 144, 145, 158, 
159, 168, 175, 176, 177, 178, 179, 180, 182, 
183, 204, 205, 208, 210, 212, 214, 223, 237, 
364 
Ratho typo of dolerite, i. 418, 421 
Red Head, section at, i. 300 
Red Hills, Skye, scenery of, i. 105 ; ii. 379 
Reed, Mr. Cowper, i. 205 
Reid, Mr. Clement, ii. 449, 450 
Renard, Prof. A., i. 148, 149 
Renfrewshire, Carboniferous volcanic rocks of, 
