ABSTRACT
Rio Negro – S. Josef – Port Desire, white pumiceous mudstone with infusoria – Port S. Julian – Santa Cruz, basaltic lava of – P. Gallegos -Eastern Tierra del Fuego: leaves of extinct beech trees – Summary on the Patagonian tertiary formations – Tertiary formations of the Western Coast – Chonos and Chiloe groups, volcanic rocks of – Concepcion – Navidad – Coquimbo – Summary – Age of the tertiary formations – Lines of elevation – Silicified wood – Comparative ranges of the extinct and living mollusca on the West Coast of S. America – Climate of the tertiary period – On the causes of the absence of recent conchiferous deposits on the coasts of S. America – On the contemporaneous deposition and preservatton of sedimentary formations.
