Talchir stage, 205, 206 Tarannon shales, 174-177 Teall, J. J. H., 289 Terrestrial rocks, 99 Thanet sands, 244 Thinning out, 28 Thrust plane, 34; detection of, 35, 82 Tiddeman, B. H., 87, 263, 270 Till, 262 Time, geological, 294-296 Toarcian series, 227, 229 Topley, W., 130, 239 Torridonian beds, 135-137 Tremadoc slates, 152, 155, 162, 163 Triassic fauna and flora, 223-225 Triassic system, 218-225; ammonite zones of, 225 Trinucleus fauna, 165 Tullberg, S. A., 162 Turonian series, 236 Unconformity, 60, 78, 98 Underclays, 197 Uniformitarianism, 287-292 Uriconian rocks, 138 Ussher, W. A. E., 183 Valentian beds, 175 Verneuil, E. P. de, 161 Volcanic rocks, Cambrian, 155; Carboniferous, 199; Devonian, 184, 186; Eocene, 246, 247; Ordovician, 165-170; Precambrian, 146 Vulcanicity, 289 Waagen, W., 213, 214 Walcott, C. D., 144, 158, 160, 161, 173 Wallace, A. R., 124, 235, 240, 281, 295 Ward, J. C., 87, 88, 263, 295 Warming, E., 115 Watts, W. W., 142, 168, 178 Wealden beds, 236, 237 Webster, T., 18 Weissliegende, 214 Wenlock limestone, 175, 176 Wenlock series, 174-177 Wenlock shale, 175-177 Werfener Schichten, 225 Werner, A. G., 12 Weybourne crag, 256 Whewell, W., 50 Whidbourne, G. F., 91 White Jura, 226 Whitehaven sandstone, 202 Whitehurst, J., 11, 12 Wiman, C., 46 Wood, S. V., 250, 259 Woodward, H., 191 Woodward, H. B., 68, 130, 131 Woodward, J., 8-10 Woodward, S. P., 108, 111 Woolhope limestone, 175 Woolwich beds, 244 Wright, G. F., 263 Yoredale series, 192 Zanclean series, 256 Zechstein, 209 Zone, fossil, 67; ammonite, 225, 237; graptolite, 69 CAMBRIDGE: PRINTED BY J. AND C. F. CLAY, AT THE UNIVERSITY PRESS. Cambridge Natural Science Manuals. BIOLOGICAL SERIES. General Editor, A. E. Shipley, M.A. =Elementary Palæontology--Invertebrate= H. Woods, M.A., F.G.S. 6_s._ =Elements of Botany= F. Darwin, M.A., F.R.S. 4_s._ 6_d._ =Practical Physiology of Plants= F. Darwin, & E. H. Acton, M.A. 4_s._ 6_d._ =Practical Morbid Anatomy= H. D. Rolleston, M.D., F.R.C.P. & A. A. Kanthack, M.D., M.R.C.P. 6_s._ =Zoogeography= F. E. Beddard, M.A., F.R.S. 6_s._ =Flowering-Plants and Ferns= J. C. Willis, M.A. In two vols. 10_s._ 6_d._ =The Vertebrate Skeleton= S. H. Reynolds, M.A. 12_s._ 6_d._ =Fossil Plants= A. C. Seward, M.A., F.G.S. 2 vols. Vol. I. 12_s._ =Outlines of Vertebrate Palæontology= A. S. Woodward. 14_s._ =The Soluble Ferments and Fermentation= J. Reynolds Green, Sc.D., F.R.S. 12_s._ =Zoology= E. W. MacBride, M.A. and A. E. Shipley, M.A. [_In the Press._ PHYSICAL SERIES. General Editor, R. T. Glazebrook, M.A., F.R.S.