4 So 
THE ANCIENT VOLCANOES OF GREAT BRITAIN 
Aveline, Mr. W. T., i. 227, 230 ; ii. 32 
Ayrshire, example of volcanic neck in, i. 56; 
Silurian volcanic rocks of, 192 ; Old Red 
Sandstone volcanic rocks of, 275, 282, 283, 
285, 291, 331 ; Carboniferous volcanic plateau 
of, 102, 368, 388, 393, 398, -110 ; Carbonifer- 
ous Puys of, 415, 416, 434, 440, 474; 
Permian volcanic rocks of, ii. 55, 58, 62 
Azoic period, i. 109 
Backstkom, Mr., ii. 266 
Baily, W. H., i. 251, 252 ; ii. 198, 449 
Bala group, i. 175, 190, 196, 201, 206, 207, 
223, 242 ; limestone of, 47, 175, 229, 245, 
251 ; volcanic rocks of, 186, 190, 207, 213, 
221, 241, 248 
Balbriggan, igneous rocks of, i. 244 
Ballagan beds (Lower Carboniferous), i. 384, 387, 
392, 393, 412, 447 
Ballantrae, volcanic rocks at, i. 192, 199 
Ballypallidy, tuffs and leaf-beds of, ii. 204, 
429 
Bamborough, Whin Sill at, ii. 2, 3, 5 
Banding of igneous rocks, i. 84, 207 ; ii. 189, 
294, 329, 354, 357, 476 
of gneiss, i, 116 
Bangor group, i. 166 
Banks, Sir Joseph, ii. 109 
Barnavave, eruptive rocks of, ii. 421 
Barrow, Mr. G., i. 201, 226, 272, 279, 380; ii. 
147, 148 
Basalt, columnar structure of, i. 24, 25 ; relation 
to gabbro, 78 • altered by carbonaceous strata, 
95 ; shells supposed to occur in, ii. 110 ; 
banded, 189 ; thickness of sheets of, 192 ; 
meaning of red layer between sheets of, 197, 
203, 206, 254 ; metaniorphism of, 272, 
276, 337, 339, 340, 347, 355, 356, 357, 358, 
362, 378, 383, 386, 397, 399, 400, 404, 413 
pre-Cambrian, i. 119, 131 ; Silurian, 206, 
207, 230, 245 ; Carboniferous, 3/8, 403, 407, 
417; ii. 1 1, 45, 46 ; Permian, 57, 96 ; 
Tertiary, 125, 136, 183, 199, 208, 291 
Basalt-conglomerate, ii. 195 
Basic volcanic rocks, silica-percentage of, i. 14 ; 
devitrification of, 20 ■ flow-structure of, 21 ; 
occurin thinner sheets than the acid, 24; meta- 
morpliic action of, 94 ; erupted at low levels, 
98 ; scenery of, 102 ; converted into schists 
by deformation, 75, 114 118, 119, 124, 129 ; 
alternation with acid, 28, 61, 131, 157, 165, 
207, 213, 238, 284, 318 ; ii. 236, 266, 278 
Bass Koek, i. 372, 373, 403 
Basseuth waits Lake, i. 335 
Bathgate, puy eruptions of, i. 440, 442, 445, 
456, 461 
Bauer, Dr. M., i. 62 
Bauxite, ii. 197, 204 
Bayiey, Mr. AV. S., ii. 330 
Bedding in lavas, i. 24 
Bell, Sir I. Lowtliian, ii. 1, 113, 137, 165 
Bernrose, Mr. H. A., ii. 10, 11, 13, 16, 17, 18, 
20, 21 
Ben Crnachan, alteration of granite at, i. 343 
Hiant, basic sills of, ii. 318 
Benaun More, felsite of, i. 347 
Berger, ,1. F., ii. 22, 95, 110, 113, 139, 140, 
141, 145, 199, 364, 426 
Bertrand, Prof. M., i. 28 
Berwickshire, i. 272, 290, 338, 375, 385, 401, 
I Berwyn Hills, i. 176, 186, 208, 218 
' Biggar, volcanic area, i. 287, 325 
Binney, E., ii. 56 
Binny Craig type of basalt, i. 419, 421 (444) 
Biotite ( see Mica) 
Bitumen in intrusive rocks, i. 421 
Blackstoue (Derbyshire), ii. 18, 21 
Blair-Alholl Limestone, i. 122 
Blake, Rev. J. F., i. 126, 130, 144, 160, 161, 
162, 163, 165, 166, 168, 220, 221, 222 
Blocks, ejected, i. 36, 423, 438 ; ii. 197, 221 
Bole between lavas, i. 442 ; ii. 197, 203, 206, 
254 
Bombay, volcanic plateau of, ii. 180 
Bombs, volcanic, i. 60 ; ii. 39 
Bouncy, Prof., i. 95, 126, 130, 136, 144. 160, 
162, 163, 164, 165, 166, 167, 168, 192^ 210, 
227 
Borrowdale Volcanic Series, i. 227 
Bosses, volcanic, i. 56, 78, 88 ; petrography of, 
89 ; differentiation in, 90 ; ii. 476 ; granitic, 
i. 93 ; metamorphism around, 94, 95 ; con- 
ditions of their intrusion, 97, 98 ; weathering 
of, 102 
Silurian, i. 215, 235 ; Old Red Sandstone, 
277, 288 ; Carboniferous, 403, 458 
Tertiary, ii. 271, 284, 327, 366, 378, 395, 
403 ; boundaries of, 382 ; relation to older 
eruptive vents, 280, 384, 399 ; relation to 
plateau basalts, 386, 396, 402, 404 ; relation 
to gabbro intrusions, 391, 402, 404 ; relation 
to the basic dykes, 395 
Bostonite, ii. 47 
Bone, Ami, i. 268, 363 ; ii. 112, 372 
Houle, M., i. 27, 29, 44, 45, 46, 61 ; ii. 375 
Boutan, M., i. 62 
Bowden Hill, type of doleritic basalt, i. 418, 
421 
Braid Hills, great vent of, i. 289, 293, 311, 
318, 323 
Bianco, Prof. W., i. 46, 417 
Breccias, volcanic, i. 31, 32, 120, 131, 135, 147, 
165, 189, 190, 197, 213, 224, 225, 233, 234, 
246, 252, 255, 289, 347 ; ii. 39, 41, 49, 195 
of nou-volcanic materials, ii. 196, 423 
Brecciated structure, i. 162, 211 
Breiddcn Hills, i. 176, 190, 208 
Brent Tor, ii. 33, 35, 36 
Breon, M. R., ii. 191 
Britain, advantageous position of, for the study 
of ancient volcanic action, i. 6 ; completeness 
of the Geological Record in, 6 ; direction 
of folds and fractures in, 11 ; chief lavas 
found in, 31 ; Vesuvian cones of, 42 ; volcanic 
plateaux of, 43 ; puys of, 46 ; lacustrine 
volcanoes of, 49 ; fissure eruptions of, 52 ; 
scenery of volcanic rocks of, 100, 101 ; pre- 
Cambrian rocks of, 111; in Cambrian time, 
141; in Silurian time, 173; in Devonian 
time, 258 ; in Old Red Sandstone time, 263 ; 
in Carboniferous time, 355 ; in Permian 
time, ii. 53 ; in older Tertiary time, 108 
Brogger, Prof., i. 28, 88, 90, 91, 92 
Bryco, J., i. 314, 369 
Buch, L. von, i. 27 ; ii. 381 
Buckland, W., ii. 95, 110, 113 
Buddie, J., ii. 113 
Builtli, i. 176, 203 
Burdiehouse Limestone, i. 361, 374, 388, 415 
463 
Burnt Country of Asia Minor, i. 2 
