636 



Index. 



FELDSPAR 



Feldspar, earthy, metamorphosis 

 of. at Port Desire, 438 



— albitic, 478 



— crystals of, with albite, 478 



— orthitic, in conglomerate of 

 Tenuyan, 492 



- — in granite of Portillo range, 494 



— in porphyries in the Cumbre 

 Pass, 514 



Feldspathic lavas, 24 



— rocks, alternating with obsi- 

 dian, 70 



— lamination, and origin of, 74 



— at St. Helena. 91 

 Fenestella (fossil), 180 

 Fernando Noronha, 27, 75 

 Ferruginous superficial beds, 160 

 Feuillee on sea level at Coquimbo, 



252 

 Fibrous calcareous matter at St. 



Jago, 15 

 Fissures of eruption, 131, 142, 145 



— relations of, to concretions, 

 395 



— upfilled, at Port Desire, 440 



— in clay slate, 521 



Fitton, Dr., on calcareous breccia, 

 165 



— on the geology of T. del Fuego, 

 446 



FitzRov, Capt., on the elevation of 

 the Falkland Islands, 210 



— on the elevation of Concepcion, 

 236 



Flagstaff-hill, St. Helena, 86 

 Fleurian de Bellevue on sphaeru- 



lites. 71 

 Fluidity of lavas, 117, 119 

 Foliation, definition of, 424 



— of rocks at Bahia, 424 



— Rio de Janeiro. 425 



— Maldonado, 429 



— Monte Video, 433 



— S. Guitru-sruevu. 434 



— Falkland L. 440 



— T. del Fuego, 446 



— Chonos Archipelago, 451 



— Chiloe, 456 



— Concepcion, 458 



— Chile, 459 



— discussion on, 460 



FOR51ATION 



Forbes, Prof. E., on the structure 

 of glaciers, 80 



— on cretaceous fossils of Con- 

 cepcion, 400 



— on cretaceous fossils and sub- 

 sidence in Cumbre Pass, 512 



— on fossils from Guasco, 551 



— on fossils from Coquimbo, 542, 

 548 



— on fossils from Copiapo, 560 



— on depths at which shells live, 

 414, 565 



Formation, Pampean, 315 



area of, 349 



estuary origin, 352 



— tertiary, of Entre Eios, 335 



of Panda Oriental, 337 



of Patagonia, 370 



summary on, 386 



of T. del Fuego, 385 



of the Chonos Archipelago, 



389 



of Chiloe, 390 



of Chile, 390 



of Concepcion, 397, 407 



— — of Navidad, 401 



of Coquimbo, 402 



of Peru, 405 



subsidence during, 419 



— volcanic, of Tres Montes, 389 

 of Chiloe, 391 



of Cumbre Pass, 511 



in Banda Oriental, 341 



old, near Maldonado, 430 



with laminar structure, 468 



ancient, in T. del Fuego, 444 



— recent, absent on S. American 

 coast, 414 



— metamorphic, of claystone por- 

 phyry of Patagonia, 435, 468 



foliation of, 462 



— plutonic, with laminar struc- 

 ture, 468 



— palseozoic, of the Falkland I. ,440 



— claystone. at Concepcion, 457 



— Jurassic, of Cordillera, 491, 512 



— Xeocomian, of the Portillo 

 Pass, 491 



— gypseous, of Los Hornos, 535, 

 649, 550 



of Coquimbo, 542 



