ON THE OLDER TERTIARY FORMATIONS OF PATAGONIA AND CHILE.
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 South America.—On the
contemporaneous deposition and preservation of sedimentary formations.