Puente del Inca, section of.
Pumice, pebbles of. --conglomerate of R. Negro. --hills of, in the Cordillera.
Punta Alta, elevation of. --beds of.
Quartz-rock of the S. Ventana. --C. Blanco. --Falkland islands. --Portillo range. --viscidity of. --veins of, near Monte Video. -- --in dike of greenstone. --grains of, in mica slate. -- --in dikes. --veins of, relations to cleavage.
Quillota, Campana of.
Quintero, elevation of.
Quiriquina, elevation of. --deposits of.
Rancagua, plain of.
Rapel, R. elevation near.
Reeks, Mr. T., his analysis of decomposed shells. --his analysis of salts.
Remains, human.
Rio de Janeiro, elevation near. --crystalline rocks of.
Rivers, small power of transporting pebbles. --small power of, in forming valleys. --drainage of, in the Cordillera.
Roads, parallel, of Glen Roy.
Rocks, volcanic, of Banda Oriental. --Tres Montes. --Chiloe. --Tierra del Fuego. --with laminar structure.
Rodents, fossil, remains of.
Rogers, Professor, address to Association of American Geologists.
Rose, Professor G., on sulphate of iron at Copiapo.
S. Blas, elevation of.
S. Cruz, elevation and plains of. --valley of. --nature of gravel in valley of. --boulder formation of. --tertiary formation of. --subsidence at.
S. Fe Bajada, formations of.
S. George's bay, plains of.
S. Helena island, sea-cliffs, and subsidence of.
S. Josef, elevation of. --tertiary formation of.
S. Juan, elevation near.
S. Julian, elevation and plains of. --salt lake of. --earthy deposit with mammiferous remains. --tertiary formations of. --subsidence at.
S. Lorenzo, elevation of. --old salt formation of.
S. Mary, island of, elevation of.
S. Pedro, elevation of.
Salado, R., elevated shells of. --Pampean formation of.
Salines.
Salt, with upraised shell. --lakes of. --purity of, in salt lakes. --deliquescent, necessary for the preservation of meat. --ancient formation of, at Iquique. -- --at S. Lorenzo. --strata of, origin of.
Salts, superficial deposits of.
Sand-dunes of the Uruguay. --of the Pampas. --near Bahia Blanca. --of the Colorado. --of S. Cruz. --of Arica.
Sarmiento, Mount.
Schmidtmeyer on auriferous detritus.
Schomburghk, Sir R., on sea-bottom. --on the rocks of Guyana.
Scotland, sloping terraces of.
Sea, nature of bottom of, off Patagonia. --power of, in forming valleys.
Sea cliffs, formation of.
Seale, Mr., model of St. Helena.
Sebastian Bay, tertiary formation of.
Sedgwick, Professor, on cleavage.
Serpentine of Copiapo.
Serpulae, on upraised rocks.
Shale-rock, of the Portillo Pass. --of Copiapo.
Shells, upraised state of, in Patagonia. --elevated, too small for human food. --transported far inland, for food. --upraised, proportional numbers varying. -- --gradual decay of. -- --absent on high plains of Chile. -- --near Bahia Blanca. --preserved in concretions. --living and fossil range of, on west coast. --living, different on the east and west coast.
Shingle of Patagonia.
Siau, M., on sea-bottom.
Silver mines of Arqueros. --of Chanuncillo. --of Iquique. --distribution of.
Slip, great, at S. Cruz.
Smith, Mr., of Jordan Hill, on upraised shells retaining their colours. --on Madeira. --on elevated seaweed. --on inclined gravel beds.
Soda, nitrate of. --sulphate of, near Bahia Blanca. --carbonate of.
Soundings off Patagonia. --in Tierra del Fuego.
Spirifers.
Spix and Martius on Brazil. Sprengel on the production of carbonate of soda.
Springs, mineral, in the Cumbre Pass.
Stratification of sandstone in metamorphic rocks. --of clay-slate in Tierra del Fuego. --of the Cordillera of Central Chile. --little disturbed in Cumbre Pass. --disturbance of, near Copiapo.
Streams of lava at S. Cruz, inclination of. --in the Portillo range.
String of cotton with fossil-shells.
Struthiolaria ornata.
Studer, M., on metamorphic rocks.
Subsidence during formation of sea-cliffs. --near Lima. --probable, during Pampean formation. --necessary for the accumulation of permanent deposits. --during the tertiary formations of Chile and Patagonia. --probable during the Neocomian formation of the Portillo Pass. --probable during the formation of conglomerate of Tenuyan. --during the Neocomian formation of the Cumbre Pass. --of the Uspallata range. --great, at Copiapo. -- --during the formation of the Cordillera.