Pampean formation.--Localities in Pampas at which mammiferous remains have
been found.


CHAPTER V.--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.


CHAPTER VI.--PLUTONIC AND METAMORPHIC ROCKS:--CLEAVAGE AND FOLIATION.
Brazil, Bahia, gneiss with disjointed metamorphosed dikes.--Strike of
foliation.--Rio de Janeiro, gneiss-granite, embedded fragment in,
decomposition of.--La Plata, metamorphic and old volcanic rocks of.--S.
Ventana.--Claystone porphyry formation of Patagonia; singular metamorphic
rocks; pseudo-dikes.--Falkland Islands, palaeozoic fossils of.--Tierra del
Fuego, clay-slate formation, cretaceous fossils of; cleavage and foliation;
form of land.--Chonos Archipelago, mica-schists, foliation disturbed by
granitic axis; dikes.--Chiloe.--Concepcion, dikes, successive formation
of.--Central and Northern Chile.--Concluding remarks on cleavage and
foliation.--Their close analogy and similar origin.--Stratification of