
INDEX 
Carlsbad twin, Io 
Carnelian, § 
Carolina, South, coprolites in, 73 
Carpathians, 265, 397 
Carse-clays, 388 
Cascades, 417 
Cassiterite. See Tin ore 
_ Casts (fossils), 91 
_ Cataclastic rocks, 80, 170, 207, 225 
Cement-stone, 70 
Centroclinal fold, 135 
Cerussite, 256 
Chabazite, 26 
Chalcedony, 5 
Chalcopyrite, 27, 230, 231, 249. Sze 
Copper ores 
Chalk, 69 
Chalybite, 29 
Charlestown (S. Carolina), coprolites 
at, 73 
Chemically formed rocks, 64 
Cherry coal, 71 
Chert, 5, 67, 84, 120 
Cheviot Hills, granite of, 189 
Chiastolite, 26, 214; -slate, 77 
Chilled edge of basalt, 51 
China-clay, 26, 62 
Chlorite, 22; -gneiss, 77; -schist, 78, 
88, 382 
Chromite, 8, 229, 230 
Chrysolite, 22 
Chrysoprase, 5 
Chrysotile, 23, 80 
Circumdenudation mountains, 403 
Clastic ore-formations, 232 
Clay-ironstone, 29, 68, 120, 232 
Clays, 61, 83, 388 
Clay-slate, 76, 82, 382 
Cleat of coal, 146 
Cleavage of minerals, 3 
Cleavage. See Slaty cleavage 
Climatic conditions deduced 
fossils, 97 
Clinometer, 127, 276, 429 
Clinozoisite, 24 
Coal, 71; joints in, 146; coked by 
igneous rock, 149; search for, 330; 
origin of, 333 
Coast-lines, 423 
Cobalt ores, 249, 263 
from 
433 
Cocardenerze (cockade ores), 247 
Coke, produced by action of intrusive 
rock upon coal, 149 
Coincident lodes, 240 
Colorado Plateau, 176 
Comby lodes, 242 
Common hornblende, 17, 19 
Common wells, 358 
Compass, 127, 276, 429 
Complex faults, 164 
Complex lodes, 240 
Composite dykes, 206 
Comstock lode, 251 
Concretions and concretionary struc- 
tures, 65, 73, 120, 231 
Conformity, 180 
Conglomerate, 60, 84, 94; auriferous, 
257; schistose, 75; crush-, 170 
Consolidation of incoherent accumula- 
tions, 105 
Constructional valleys, 413 
Contact metamorphism, 214, 219 
Contact ore-formations, 260 
Contemporaneous erosion, II2 
Contemporaneous igneous rocks, 208 
Contemporaneous ore-formations, 228 
Contemporaneous veins, 207 
Contents of fissure-veins, 244 
Contorted strata, 141 
Contraction, a cause of jointing, I50 
Convergent lodes, 242 
Copper, 229; ores of, 249, 251, 261, 
263 
Coprolites, 73 
Coralline Crag, coprolites of, 73 
Cordierite, 25 
Cordilleras of South America, 401 
Cornstone, 70 
Cornwall, ores of, 234, 251 
Corroded minerals in igneous rocks, 35 
Corsite, 48, 124 
Corundum, 9 
Coulmore, 406 
Country-rock, 237 
Crag-and-tail, 314 
Crater lakes, 419 
Cross-bedding, IT5 
Cross-galleries in coal-mines, 146 
Cross-joints, 147, 152 
Cross-veins, 243 
2E 
