The Ancient Volcanoes of Great Britain: Volume II, by Sir Archibald Geikie

Troctolite, ii. 332
Tuffs, i. 31;
association of, 33;
composition of, 34;
alternations of, 34, 61;
blending of, with non-volcanic sediment, 35, 437;
fossiliferous, 36;
without lava, 36;
necks of, 58;
relation of, to lavas, 61;
metamorphism of, ii. 224
—— pre-Cambrian, i, 125, 135;
Cambrian, 147, 151, 155, 163, 165, 167;
Silurian, 178, 189, 190, 195, 205, 209, 212, 213, 222, 224, 229, 232, 241, 245, 246, 254, 255;
Devonian, 262;
Old Red Sandstone, 279, 281, 289, 337, 339, 351;
Carboniferous, 381, 384, 387, 399, 422, 427, 429, 432, 436, 466; ii. 11, 18, 24, 36;
Permian, 57, 58;
Tertiary, 194, 197, 202, 204, 211, 222
Tyrol, Triassic eruptive rocks of, i. 29
Tyrone, Old Red Sandstone of, i. 314

Ulster, Old Red Sandstone volcanic rocks of, i. 314
Ultra-basic rocks, i. 14, 118, 377, 417
Unconformability, deceptive case of, i. 163
Urgneiss, i. 110
Uriconian volcanic rocks, i. 129
Ussher, Mr. W. A. E., i. 260, 262; ii. 35, 95
Utah, laccolites of, i. 86;
volcanic regions of, ii. 115, 267

Valleys, tendency of vents to appear in, i. 272, 368, 376; ii. 61, 65, 96
Vapours, action of volcanic, i. 13, 15, 16, 17, 31, 57, 72, 78, 97, 99, 180, 289, 426
Variolitic structure, i. 21, 206, 235
Veins, intrusive, i. 66, 77, 79, 98, 426, 429; ii. 311, 313, 400, 410, 432, 437
Velay, volcanic rocks of, i. 26, 27, 29, 60; ii. 271, 373, 375
Vents, volcanic, i. 53;
ground-plans of, 54;
size of, 55;
filled with non-volcanic detritus, 57;
ejected crystals found in, 62;
agglomerates of, 62; ii. 13, 28, 47, 61, 69, 276, 280, 284, 288, 289;
stratification in, i. 63; ii. 80;
metamorphism in, i. 67, 71;
metamorphism of rocks around, 72, 349, 350, 352, 399, 404, 432; ii. 76, 272, 280;
connection of, with geological structure-lines, i. 68;
occurrence of, in lines and in groups, 69;
double and multiple, 69;
possible indications of length of activity of, 72;
inward dip of strata around, 73, 352; ii. 76, 295;
stages in history of, i. 74;
tendency of, to rise in lines of valley, 272, 368, 376; ii. 61, 65, 96, 468;
criteria for the relative ages of, 270;
connection of, with later eruptive bosses, 280, 384, 399, 400
—— Silurian, i. 209, 214, 234;
Old Red Sandstone, 272, 287, 298, 305, 323, 328, 337;
Carboniferous, 394, 399, 400, 404, 406, 424, 465; ii. 13, 28, 47;
Permian, 61, 69;
Tertiary, 202, 270, 294, 400
Vesicular structure of lavas, i. 15; ii. 187
Vesuvius, denudation of, i. 3;
as an active volcano, 4;
as a type of volcano, 10, 39, 53, 100; ii. 108, 115, 261, 266
Vicary, Mr. W., ii. 95
Vogesite, i. 277, 293
Volcanello Island, i. 70
Volcanic action, permanent traces of, i. 4;
of present time elucidates that of the past, 5;
submarine, 5;
transient effects of, 8;
chief factors in, 10;
explosive energy of, 13, 99;
uniformity of, in geological time, 13, ii. 470;
metamorphism by, i. 67, 71;
underground phases of, 77;
proofs of gradual quiescence of, 155, 157, 166;
connected with subsidence, 295, 297; ii. 205, 444, 463, 470;
repetition of, in the same region, i. 368, 375, 377; ii. 42, 69, 94, 467;
developed along continental borders, 466;
persistence of, in Britain, i. 7; ii. 466;
connection of, with lines of geological structure, 468;
connection of, with terrestrial disturbance, 469;
gradual decline of, during Palæozoic time, 471;
quiescence of, during Mesozoic time, 472
Volcanic cycles, i. 27, 92
—— products, general characters of, i. 14;
persistent uniformity of, 30, 46;
thickest mass of, in Britain, 229 (see Agglomerate, Lava, Tuff)
Volcano, Island of, i. 4, 24
Volcanoes, their influence on mythology, i. 1, 2;
denudation of, 3;
number of extinct, 4;
ancient, of Britain, 6;
influence on scenery, 8, 100, 102;
defined, 10;
types of, 10, 39; ii. 471;
determination of relative dates of, i. 46;
their geographical condition in old times, how ascertained, 48;
parasitic, 69;
contemporaneous denudation of, 73, 100;
connected with granite, 89;
incompleted, 86, 93, 99
Vom Rath, G., ii. 474

Wacke, i. 157
Walcott, Mr., i. 30
Wales, pre-Cambrian rocks of, i. 126, 142;
early geological work in, 142;
Cambrian volcanoes of, 145, 159;
volcanic scenery of, 176;
Silurian volcanoes of, 176, 202, 205, 207, 218, 219;
Old Red Sandstone of, 257, 259
Waller, Mr. T. H., i. 171, 278
Ward, J. C., i. 227, 228, 229, 230, 231, 233, 234, 235, 236, 237; ii. 23
Warwickshire, Cambrian rocks of, i. 137, 171
Waterford, volcanic region of, i. 247
Watts, Mr. W. W., i. 131, 132, 135, 137, 189, 190, 191, 243, 276, 278, 336, 347, 417, 421, 423; ii. 40, 42, 43, 45, 57, 96, 184, 204, 224, 272, 424, 425
Weaver, T., i. 238
Wenlock group, i. 175;
volcanic rocks of, 552
Wernerian School, ii. 109
West Lothian, volcanic rocks of, i. 47, 55, 415, 433, 437
Whin Sill of England, i. 83, 85, 97, 449; ii. 2
Whitehurst, J., ii. 9, 109
White trap, i. 96, 426, 449, 456; ii. 65, 87, 103, 165, 252
Williams, Mr. G. J., i. 179, 185, 186, 188
Williamson, W. C., i. 392
Wilson, Mr. J. S. Grant, i. 148, 149, 153, 276, 344, 375, 379, 380; ii. 137, 164
Wilson, Mr. A., ii. 49
Winch, N. T., ii. 113, 147
Witham, H. T. M., ii. 113, 238
Wood, N., ii. 113
Woods, Mr. H., i. 204
Woodward, Dr. Henry, ii. 449
Woodward, Mr. H. B., ii. 32, 435, 453
Worcestershire, latest eruptive rocks of, ii. 101
Worth, Mr. R. N., ii. 99
Wrekin, i. 130
Wright, J. R., ii. 102

Edited by S. F. Harmer, M.A, Fellow of King's College, Cambridge, Superintendent of the University Museum of Zoology; and A. E. Shipley, M.A., Fellow of Christ's College, Cambridge, University Lecturer on the Morphology of Invertebrates.

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