646 



Index. 



SUMMAEY 



Summary on the cretaceo-oolitic 

 formation, 586 



— on the subsidences of the Cor- 

 dillera, 588 



— on the elevation of the Cordil- 

 lera, 590, 601 



TACNA, elevation of, 265 

 Tahiti, 30 

 Talus, stratified, within tuff craters, 



121 

 Tampico, elevated shells near, 275 

 Tandil, crystalline rocks of, 434 

 Tapalsruen, Pampean formation 

 of, 317 



— crystalline rocks of, 434 

 Tavlor, Mr., on copper veins of 



Cuba, 581 

 Temperature of Chile during the 



tertiary period, 412 

 Tension, lines of, origin of axes of 



elevation and of cleavage, 469 

 Tenuy Point, singular section of, 393 

 Tenuyan, valley of, 492, 533 

 Terceira, 28 

 Terraces of the valley of S. Cruz, 204 



— of equable heights throughout 

 Patagonia, 210 



— of Patagonia, formation of, 216 



— of Chiloe, 235 



— at Conchalee, 247 



— of Coquimbo, 252 



— not horizontal at Coquimbo, 255 



— of Guasco, 261 



— of S. Lorenzo, 266 



— of gravel within the Cordillera, 

 290 



Tertiary deposit at St. Jago, 7 



Theories on the origin of the Pam- 

 pean formation, 350 



Tierra amarilla. 553 



Tierra del Fuego, form of sea- 

 bottom, 227 



— tertiary formations of, 385 



— clayslate formation of, 441 



— cretaceous formation of, 443 



— crystalline rocks of, 443 



— cleavage of clayslate, 416, 461 

 Tosca rock, 315 



Trachyte at Terceira, 28 



TUFF 



Trachyte, decomposition of, by 

 steam, 28 



— at Ascension, 48 



— softened at Ascension, 48 



— with singular veins, 51 



— absent at the Galapagos Archi- 

 pelago, 129 



— its separation from basalt, 133 



— specific gravity of, 136 



— of Chiloe, 390' 



— of Port Desire, 436 



— in the Cordillera, 480 

 Traditions of promontories having 



been islands, 235 



— on changes of level near Lima, 

 272 



Trap-dikes in the plutonic series, 

 139 



— at King George's Sound, 161 

 Travertin at Van Diemen's Land, 



157 

 Trees buried in plain of Iquique, 

 304 



— silicified, vertical, of the Us- 

 pallata range, 52 7 



Tres Montes, elevation of, 232 



— volcanic rocks of, 389 

 TAgorwcelia insolita, 387 

 Tristan Arroyo, elevated shells of, 



191 

 Tropic - bird, now rare, at St. 



Helena, 103 

 Tschudi, Mr., on subsidence near 



Lima, 272 

 Tuff, craters of, 111, 113, 119, 121 



— peculiar kind of, 112, 113 



— their breached state, 127 



— calcareous, at Coquimbo, 250 



— on basin-plain near St. Jago, 

 2S4 



— structure of, in Pampas, 315 



— origin of, in Pampas, 353 



— pumiceous, of R. Negro, 371 



— Xuevo Gulf, 373 



— Port Desire, 374 



— S. Cruz, 378 



— Patasronia, summary on, 386 



— Chiloe, 392 



— formation of, in Portillo chain, 

 498 



— great deposit of, at Copiapo, 572 



