Theories on the origin of the Pampean formation.
Tierra Amarilla.
Tierra del Fuego, form of sea-bottom. —tertiary formations of. —clay-slate formation of. —cretaceous formation of. —crystalline rocks of. —cleavage of clay-slate.
Tosca rock.
Trachyte of Chiloe. —of Port Desire. —in the Cordillera.
Traditions of promontories having been islands. —on changes of level near Lima.
Trees buried in plain of Iquique. —silicified, vertical, of the Uspallata range.
Tres Montes, elevation of. —volcanic rocks of.
Trigonocelia insolita.
Tristan Arroyo, elevated shells of.