Tschudi, Mr., on subsidence near Lima.
Tuff, calcareous, at Coquimbo. —on basin-plain near St. Jago. —structure of, in Pampas. —origin of, in Pampas. —pumiceous, of R. Negro. —Nuevo Gulf. —Port Desire. —S. Cruz. —Patagonia, summary on Chiloe. —formation of, in Portillo chain. —great deposit of, at Copiapo.
Tuffs, volcanic, metamorphic, of Uspallata. —of Coquimbo.
Ulloa, on rain in Peru. —on elevation near Lima.
Uruguay, Rio, elevation of country near.
Uspallata, plain of. —pass of. —range of. —concluding remarks on.
Valdivia, tertiary beds of. —mica-slate of.
Valley of S. Cruz, structure of. —Coquimbo. —Guasco, structure of. —Copiapo, structure of. —S. Cruz, tertiary formations of. —Coquimbo, geology of. —Guasco, secondary formations of. —Copiapo, secondary formations of. —Despoblado.
Valleys in the Cordillera bordered by gravel fringes. —formation of. —in the Cordillera.
Valparaiso, elevation of. —gneiss of.