Cryptogams, earliest fossil, 318 Cyrena, 429, 436 Cyrtia, 346 Cyrtoceras, 333,347,375 Cystiphyllum, 345 Cytherea, 429, 444 Dadoxylon, 357 Dalmanites, 344* Danian, 417,421 Daonella, 383 Dapedius, 395 Dasorius, 430 Dead Sea, originally fresh, 64 Deer, fossil, 444, 448, 451 398; Cretaceous, 415 Denbighshire Grits, 335 Crystalline forms of minerals, 166, Denudation (see weathering, Rain, 167 Crystalline rocks, 190 Crystalline structure of rocks, 169 Crystallites, 190, 214 Ctenodonta, 332 Cubical system of crystals, 167 Cucullea, 346, 347* Cupressinites, 428 Cupressocrinus, 345 Curvature of strata, 251 Cyathaxonia, 324 Cyathocrinus, 362 Cyathophyllum, 324, 345* Springs, Rivers, Glaciers, Sea), Dicotyledonous known, 408 plants, earliest Cycadeoidea, 390* Cycadites, 390 Cycads, fossil, 291, 374, 379, 382,* Dictyograptus, 323, 324* 390* Cypræa, 444 Cypridina-shales, 347 Cyprina, 451 Cypris, 363 Dictyonema, 323, 324 Dicynodon, 385 Didymograptus, 323* Dimetric crystals, 167 Dimorphodon, 398 * Erratics, 86, 466 Dolphin, fossil, 443 Eskers, 465 Dragon-flies, fossil, 358, 394 Estuaries, deposit of mud in, 101 Earth-worms, co-operation of, in Echini, fossil, 361,* 393* Echinoconus, 411* Exogyra, 393, 412 FAGUS, 428 Fairy-stones, 187, 235 259 Fault-rock, 257 Felis, 464 Felsite, 215 Felspars, 175 Fenestella, 364* Echinoderms, fossil, 326, 345, 361, Ferns, fossil, 319, 339,* 355,* 373, * 381, 390 Ferric oxide, 79, 164; as a cement of rocks, 244 Ferrous carbonate, 181, 187, 208, Ferrous oxide, 164 211, 236, 287 Ferrous sulphate, 79 Ferruginous cement of sandstones, Fuller's Earth, 401, 403 200 Fibrous minerals, 169 * Ficus, 409, 441,* 448 Fig, fossil, 408, 428, 440, 448 Fire-clay, 201; origin of, 228, 351 Fir-trees, fossil, 390, 451 Fishes, fossil, 333, 34, 365, 375,* Flamingoes, fossil, 436 Footprints in rocks, 233, 279, 382, Foraminifera, Silurian, 321; Car- boniferous, 410,* Eocene, 429 Foraminiferal ooze, 114 Forest-Bed Group, 451 Forest-Marble, 401 Fusion, crystallisation formed from, 190 Fusulina, 361* GABBRO, 220 Galerites, 411 Ganoids, fossil, 340, 359 Gas globules in the minerals of rocks, 190 Gasteropods, 332 Geographical changes indicated by Geological chronology established by Geological Record, 292, 304; im- Geology, aims of, 6, 299 Geysers, 80 Forests, influence of, 109; buried, Ginko, 428 288 Formation, geological, 294 Fossils, definition of, 279; conditions | for production of, 284; indicate Fox, Arctic, 463, 472 Fragmental rocks, 187, 196 Freestone, 200 Frogs, fossil, 440 Frost, influence of, 17 Giraffes, fossil, 444, 448, 453 Glacial group of deposits, 455 457; polish and striate rocks, 88, Glass, volcanic, 169, 191; enclosed Glassy condition of rocks, 191, 217, 273 Glauconitic, 200 Glyptichus, 391 Glyptocrinus, 325 Glyptolæmus, 341 Glyptostrobus, fossil, 448, 449* Gneiss, 224, 308 Great Oolite, 401, 403 Greensand, 295 Hempstead Beds, 437 Hettangian, 401 Hexagonal system of crystals, 167 Hippopodium, 393 Hippopotamus, fossil, 443, 451, 464, 469, 472 Hippurite-limestone, 412, 422 Greensand, Lower, 419; Upper, 419 Holaster, 412 Greenstone, 220 Greywacke, 200 Greywacke rocks (Silurian), 316 Griffithides, 363 Grit, 200; schistose, 225 Ground-ice, 83 Group, stratigraphical, 294 Grouse, fossil, 436 Gryllidæ (crickets), fossil, 359 Gum-tree, fossil, 408, 429 HADE of a fault, 257 Halysites, 324 Hazel, fossil, 428, 451 Holopæa, 333 Holoptychius, 340 Homalonotus, 329,* 344* Honestone, 222 Horizon, stratigraphical, 293 Hornbeam fossil, 428, 440 Hornbill, African, early forms of, 430 434, 437; Miocene, 445, 446 Inferior Oolite, 401 Infusorial earth, 111 Inoceramus, 412* Insects, fossil, 281, 284, 334, 339, Lamantin, fossil, 443 358, 388, 394 Interglacial periods, 461 Intrusive sheets, 268 Iron, 155, 163; oxides, 164, 171; Iron-ore of lake bottoms, 62 Ironstone, 62, 79, 172, 207, 210, Iron-sulphate in natural waters, 79 |